Arnie Stein

Top Metro Denver agent for over 4 decades! Sold approximately 3000 homes!
Numerous awards for Excellence and Results, RE/MAX Hall of Fame and
RE/MAX Lifetime Achievement Award. Owned 2 National Franchise RE Companies

#1 Agent RE/MAX Masters, Inc. 2013, Numerous Monthly #1 Awards,
Many past Top 10 Agent/Team awards citywide

Started at Moore and Company in 1978. Received award as Rookie for most creative transaction!
Owned Metro Brokers, Stein & Co.
President Broker/Owner Legend Realty, Better Homes and Gardens
President Broker/Owner Prudential Legend Realty
Worked for LIV Sothebys 7 years then 12 years with RE/MAX and currently with RE/MAX Professionals

RE/MAX Professionals
6020 Greenwood Plaza Boulevard
Greenwood Village, CO 80111, USA

Contact Me

Active Residential

MLS# 9103246 | 2025-08-07T18:16:16.714Z

3230 S Krameria Stre

Denver, CO 80222

$ 719,900

Bathrooms3
Bedrooms3
Car Spaces2
Sqft3193 Sqft
Acres0.24

Active Residential

MLS# 9005392 | 2025-08-07T18:14:16.771Z

3724 S Poplar Street

Denver, CO 80237

$ 779,900

Bathrooms3
Bedrooms4
Car Spaces2
Sqft2771 Sqft
Acres0.24

Active Residential

MLS# 1502929 | 2024-01-03 06:40:20

755 South Jackson S

Denver, CO 80209

$ 1,800,000

Car Spaces3
Sqft7348 Sqft
Acres0.28

Show All Properties

Active Land

MLS# 1591736 | 2025-08-08T04:44:16.515Z

466 Spring Valley Dr

Florissant, Co 80816

$ 45,000

Acres2.12

Active Residential

MLS# 6540628 | 2025-08-08T03:02:16.842Z

6077 Idlewild Place

Brighton, Co 80601

$ 559,900

Bathrooms3
Bedrooms3
Car Spaces2
Sqft2651 Sqft
Acres0.21

Active Residential

MLS# 8782957 | 2025-08-08T02:20:18.382Z

1187 Syracuse Street

Denver, Co 80220

$ 599,000

Bathrooms2
Bedrooms6
Sqft2420 Sqft
Acres0.12

Active Residential

MLS# 8449941 | 2025-08-08T01:25:16.591Z

10934 Touchstone Loo

Parker, Co 80134

$ 779,900

Bathrooms4
Bedrooms5
Car Spaces2
Sqft3500 Sqft
Acres0.16

Active Condominium

MLS# 5740084 | 2025-08-08T01:16:16.545Z

725 S Alton Way #7d

Denver, Co 80247

$ 239,000

Bathrooms2
Bedrooms2
Car Spaces1
Sqft1200 Sqft

Active Tonwhome

MLS# 9637801 | 2025-08-08T00:11:17.955Z

738 N Bently Street

Watkins, Co 80137

$ 389,900

Bathrooms3
Bedrooms2
Car Spaces2
Sqft1489 Sqft
Acres0.04

Active Residential

MLS# 5155455 | 2025-08-08T00:11:17.903Z

687 N Deer Park Stree

Watkins, Co 80137

$ 518,800

Bathrooms3
Bedrooms3
Car Spaces2
Sqft2701 Sqft
Acres0.12

Active Residential

MLS# 2324679 | 2025-08-08T00:09:17.362Z

1423 Tweed Street

Colorado Springs, Co 8090

$ 549,000

Bathrooms3
Bedrooms4
Car Spaces2
Sqft2476 Sqft
Acres0.26

Active Residential

MLS# 7928217 | 2025-08-08T00:05:18.235Z

39765 Gibson Street

Elizabeth, Co 80107

$ 609,900

Bathrooms3
Bedrooms4
Car Spaces3
Sqft3300 Sqft
Acres0.18

Active Tonwhome

MLS# 1840859 | 2025-08-08T00:03:19.060Z

8957 Whiteclover Str

Littleton, Co 80125

$ 524,900

Bathrooms3
Bedrooms3
Car Spaces2
Sqft1623 Sqft
Acres0.05

Active Residential

MLS# 2403572 | 2025-08-08T00:02:21.379Z

330 Donna Lane

Johnstown, Co 80534

$ 524,900

Bathrooms3
Bedrooms4
Car Spaces3
Sqft2083 Sqft
Acres0.28

Active Residential

MLS# 3878436 | 2025-08-08T00:02:18.948Z

14857 Arbor Boulevar

Thornton, Co 80602

$ 586,499

Bathrooms3
Bedrooms4
Car Spaces2
Sqft2122 Sqft
Acres0.08

Active Residential

MLS# 6704551 | 2025-08-08T00:02:18.902Z

14863 Arbor Boulevar

Thornton, Co 80602

$ 553,990

Bathrooms3
Bedrooms4
Car Spaces2
Sqft1803 Sqft
Acres0.07

Active Residential

MLS# 2137200 | 2025-08-08T00:02:18.855Z

14877 Arbor Boulevar

Thornton, Co 80602

$ 544,990

Bathrooms3
Bedrooms3
Car Spaces2
Sqft1606 Sqft
Acres0.07

Active Residential

MLS# 9538796 | 2025-08-08T00:02:18.706Z

39745 Gibson Street

Elizabeth, Co 80107

$ 623,900

Bathrooms3
Bedrooms4
Car Spaces3
Sqft2952 Sqft
Acres0.18

Active Residential

MLS# 8036842 | 2025-08-08T00:02:17.437Z

26741 E Peakview Plac

Aurora, Co 80016

$ 994,900

Bathrooms3
Bedrooms4
Car Spaces3
Sqft4640 Sqft
Acres0.17

Active Residential

MLS# 4290487 | 2025-08-07T23:51:17.242Z

23411 E Long Place

Aurora, Co 80016

$ 584,950

Bathrooms2
Bedrooms2
Car Spaces2
Sqft2020 Sqft
Acres0.45

Active Residential

MLS# 7353681 | 2025-08-07T23:19:16.739Z

4316 Shirley Drive

Johnstown, Co 80534

$ 584,900

Bathrooms4
Bedrooms4
Car Spaces3
Sqft2584 Sqft
Acres0.15

Active Residential

MLS# 2748393 | 2025-08-07T23:19:16.653Z

440 Donna Lane

Johnstown, Co 80534

$ 542,900

Bathrooms3
Bedrooms4
Car Spaces3
Sqft2391 Sqft
Acres0.17

Active Residential

MLS# 4435037 | 2025-08-07T23:18:16.694Z

4304 Shirley Drive

Johnstown, Co 80534

$ 524,800

Bathrooms2
Bedrooms3
Car Spaces2
Sqft1986 Sqft
Acres0.15

Active Residential

MLS# 6326312 | 2025-08-07T23:17:16.799Z

430 Donna Lane

Johnstown, Co 80534

$ 499,800

Bathrooms3
Bedrooms3
Car Spaces3
Sqft1862 Sqft
Acres0.17

Active Residential

MLS# 2434617 | 2025-08-07T23:14:18.176Z

3128 Ironton Drive

Loveland, Co 80538

$ 805,900

Bathrooms4
Bedrooms5
Car Spaces3
Sqft4266 Sqft
Acres0.16

Active Residential

MLS# 4746516 | 2025-08-07T23:13:16.999Z

3156 Ironton Drive

Loveland, Co 80538

$ 879,050

Bathrooms5
Bedrooms5
Car Spaces4
Sqft4557 Sqft
Acres0.16

Active Residential

MLS# 2831286 | 2025-08-07T23:12:16.555Z

3109 Ironton Drive

Loveland, Co 80538

$ 709,900

Bathrooms4
Bedrooms5
Car Spaces3
Sqft3911 Sqft
Acres0.17

Show All Properties

Jun 19, 2021 Buyers

Colorado Masters Radio

The Strength of Residential Real Estate

Eugene O’Brien of RE/MAX Masters Property Management stops by to offer property management tips for a booming residential real estate market. Barry, Larry, and Chris discuss the advantages of investing in residential real estate as oppose...

Jun 19, 2021 Buyers

Colorado Masters Radio

Timing Is Everything

Barry, Larry, and Chris explain how being patient on waiting to put your house on the market at the right time can make a huge difference in returns. Eugene O’Brien of RE/MAX Masters Property Management drops by the studio to talk about h...

Jun 17, 2021 Interview

Colorado Masters Radio

Adam Contos, CEO RE/MAX International

Interview of Adam Contos, CEO of RE/MAX International. Adam and Jim discuss the entrepreneurial spirit of RE/MAX, the challenges presented by COVID, and how Adam manages his day-to-day routine. The post Adam Contos, CEO RE/MAX International...

Dennis Boedewig, RE/MAX Masters Millennium Realtor

Jun 15, 2021 Agents

Colorado Masters Radio

Dennis Boedewig, RE/MAX Masters Millennium Realtor

Interview of Dennis Boedewig, RE/MAX Masters Millennium Realtor. Boedewig talks about his upbringing in Philadelphia, how we navigated the real estate market during the pandemic, and why he chose RE/MAX. The post Dennis Boedewig, RE/MAX Mas...

Jun 12, 2021 Buyers

Colorado Masters Radio

Staying Informed

Barry, Chris, and Travis talk about the importance of staying up-to-date on trends and news for wealth builders. Mike Rabon of Mortgage300 drops by the studio to talk about how reverse mortgages can benefit seniors. The post Staying Informe...

Jun 12, 2021 Buyers

Colorado Masters Radio

The Myths of Reverse Mortgages

Mike Rabon of Mortgage300 stops by to debunk some of the myths around reverse mortgages. Barry, Chris, and Travis discuss the advantages homesellers can reap from doing renovations before putting a home on the market. The post The Myths of ...

May 29, 2021 Consumers

Colorado Masters Radio

The Tools of Investing

Barry, Chris, and Travis discuss why information and real estate are the most important tools in investing. They explore all the reasons why it’s important to do thorough research before investing in residential real estate. The post The ...

May 29, 2021 Agents

Colorado Masters Radio

Treachery in the Marketplace

Barry, Chris, and Travis discuss the various pitfalls buyers and sellers should be careful to avoid in the current real estate market. They talk about what is driving the rising median price in Colorado Springs and Denver. The post Treacher...

May 22, 2021 Investors

Colorado Masters Radio

The Different Types of Investments

Barry and Chris discuss why diversifying assets is the safest way to invest. Eugene O’Brien of Re/Max Masters Property Management drops by the studio to explain why you need a top-notch property manager if you choose to invest in resident...

May 22, 2021 Buyers

Colorado Masters Radio

When To Buy And When To Sell

Barry and Chris talk about why homesellers should wait to sell until they can maximize their value. Eugene O’Brien of Re/Max Masters Property Management stops by to talk about the personality traits of a top-notch property manager The pos...

Debra Reinhard, RE/MAX Masters Millennium Realtor

May 18, 2021 Agents

Colorado Masters Radio

Debra Reinhard, RE/MAX Masters Millennium Realtor

Interview of Debra Reinhard, RE/MAX Masters Millennium Realtor. Reinhard talks about the importance of serving clients as a realtor, how she navigated the real estate market during the pandemic, and her love of dogs. The post Debra Reinhard...

Reasons for Wealth Builders to Celebrate

May 15, 2021 Consumers

Colorado Masters Radio

Reasons for Wealth Builders to Celebrate

Barry, Larry, Chris, and Travis explain how to find the best local real estate markets to invest in. They list out several things that investors can celebrate about the current market. The post Reasons for Wealth Builders to Celebrate appea...

May 15, 2021 Consumers

Colorado Masters Radio

Tips Homesellers Need to Know

Barry, Larry, and Travis go over the importance of taking time to prepare your home before putting it on the market. They explain how sellers can avoid becoming emotionally overwhelmed during the process. The post Tips Homesellers Need to K...

Samantha Gilbert, RE/MAX Masters Millennium Realtor

May 13, 2021 Agents

Colorado Masters Radio

Samantha Gilbert, RE/MAX Masters Millennium Realtor

Interview of Samantha Gilbert, RE/MAX Masters Millennium Realtor. Gilbert talks about why she likes working with first-time home buyers, lessons she learned from her realtor father, and how competitive dance informed her abilities later in ...

Brandon Kass, RE/MAX Masters Millennium Realtor

May 11, 2021 Agents

Colorado Masters Radio

Brandon Kass, RE/MAX Masters Millennium Realtor

Interview of Brandon Kass, RE/MAX Masters Millennium Realtor. Kass talks about why he chose RE/MAX, how he navigated the pandemic, and his background in the sailing industry. The post Brandon Kass, RE/MAX Masters Millennium Realtor appeared...

May 8, 2021 Agents

Colorado Masters Radio

The Importance of Property Management

Eugene O’Brien of RE/MAX Masters Property Management drops by the studio to explain the value a top-notch property manager can provide. Barry, Larry, and Travis describe the four phases of the investor’s lifecycle. The post The Importan...

May 8, 2021 Buyers

Colorado Masters Radio

Start a Bidding War

Barry, Larry, and Travis explain how homesellers can create a bidding war for their property. Eugene O’Brien of Re/Max Masters Property Management drops by the studio to explain the year-over-difference in the Denver real estate market fo...

The Four Phases of the Investors Lifecycle

May 1, 2021 Buyers

Colorado Masters Radio

The Four Phases of the Investors Lifecycle

Mike Rabon of Mortgage300 drops by the studio to talk about how reverse mortgages can be beneficial for seniors. Barry, Larry, and Travis define the four phases of the investor’s lifecycle. The post The Four Phases of the Investors Lifecy...

May 1, 2021 Buyers

Colorado Masters Radio

Buyers Beware

Mike Rabon of Mortgage300 stops by to explain the different reverse mortage options available to consumers. Barry, Larry, and Travis talk discuss why homebuyers need to be wary of misinformation. The post Buyers Beware appeared first on Col...

Matt Mansfield, RE/MAX Masters Millennium Realtor

Apr 30, 2021 Agents

Colorado Masters Radio

Matt Mansfield, RE/MAX Masters Millennium Realtor

Interview of Matt Mansfield, RE/MAX Masters Millennium Realtor. Mansfield talks about tips to stay competitive when a home has multiple offers, how his experience in the mortgage industry helped him become a better problem solver, and the i...

John Skoglund III, RE/MAX Masters Millennium Realtor

Apr 29, 2021 Agents

Colorado Masters Radio

John Skoglund III, RE/MAX Masters Millennium Realtor

Interview of John Skoglund III, RE/MAX Masters Millennium Realtor. John talks about why he chose RE/MAX, transitioning into a career as a realtor, and his background working for the federal government. The post John Skoglund III, RE/MAX Mas...

Apr 24, 2021 Investors

Colorado Masters Radio

Tips for New Investors

Josh Veenstra of Community Banks Mortgage stops by the studio to detail loan options for new investors. Barry, Larry, and Travis explain why investing in residential real estate is safer than investing in the stock market. The post Tips for...

Apr 24, 2021 Banks

Colorado Masters Radio

Reality vs Expectations

Barry and Larry explain next moves when reality doesn’t meet your expectations during the homeselling process. Josh Veenstra of Community Banks Mortgage explains how buyers can navigate a competitive marketplace. The post Reality vs Expec...

Mark Rielly, RE/MAX Masters Millennium Realtor

Apr 21, 2021 Agents

Colorado Masters Radio

Mark Rielly, RE/MAX Masters Millennium Realtor

Interview of Mark Rielly, RE/MAX Masters Millennium Realtor. Rielly talks about how growing up around the building industry informed his abilities as a realtor, why he chose RE/MAX Masters Millennium, and why realtors need to sift misinform...

Apr 17, 2021 Consumers

Colorado Masters Radio

Building Startup Capital

Eugene O’Brien of RE/MAX Masters Property Management stops by to describe how tenants and property managers can have mutally beneficial partnerships. Barry, Larry, and Sherry explain how to build startup capital. The post Building Startup...

Apr 17, 2021 Agents

Colorado Masters Radio

The State of the Real Estate Market

Barry, Larry, and Sherry discuss the impact of current interest rates on the housing market. Eugene O’Brien of RE/MAX Masters Property Management drops by the studio to talk about the tenant vetting process from a property manager’s per...

Rachel Smith, RE/MAX Masters Millennium Realtor

Apr 14, 2021 Agents

Colorado Masters Radio

Rachel Smith, RE/MAX Masters Millennium Realtor

Interview of Rachel Smith, RE/MAX Masters Millennium Realtor. Smith talks about her background in property management, why she chose RE/MAX Masters Millennium to start her career as a realtor, and her thoughts on skill versus luck. The post...

Apr 10, 2021 Mortgage

Colorado Masters Radio

The Facts About Reverse Mortgages

Mike Rabon of Mortgage300 drops by the studio to talk about the advantages provided by a reverse mortgage. Barry, Larry, and Sherry discuss the fundamental importance of conducting research to improve your wealth building strategies. The po...

Apr 10, 2021 Consumers

Colorado Masters Radio

Sell Now or Sell Later

Mike Rabon of Mortgage300 stops by the studio to talk about the differences in selling your home right now versus selling later in the year. Barry, Larry, Sherry, and Travis discuss the importance of doing a complete market analysis prior t...

Denice Reich, RE/MAX Masters Millennium Realtor

Apr 7, 2021 Agents

Colorado Masters Radio

Denice Reich, RE/MAX Masters Millennium Realtor

Interview of Denice Reich, RE/MAX Masters Millennium Realtor. Reich talks about her experience being only the second woman hired by RE/MAX International, why her failures were instrumental to her success, and how she navigated her business ...

Apr 3, 2021 Consumers

Colorado Masters Radio

Invest Within Your Comfort Zone

Barry and Larry discuss data that shows how you can be debt-free in as little as 1-2 years. Barry and Larry explain why it’s important to stay within your comfort zone, even when you’ve set ambitious wealth-building goals. The post Inve...

Apr 3, 2021 Agents

Colorado Masters Radio

Selling Your Home with the Right Agent

Barry, Larry, Sherry, and Travis discuss the utmost importance of selecting the right agent before selling a home. They explore the many reasons why it’s important to use raw data before pricing a property to go on the market. The post Se...

Mar 27, 2021 Consumers

Colorado Masters Radio

Diversifying Your Revenue Streams

Barry, Larry, and Sherry discuss the importance of diversifying income and revenue streams. They explain why real estate and property are better assets than the stock market for wealth building. The post Diversifying Your Revenue Streams ap...

The Best Places to Invest in Real Estate

Mar 27, 2021 Consumers

Colorado Masters Radio

The Best Places to Invest in Real Estate

Barry and Larry discuss the findings of the revised list of median prices in the top 200 real estate markets according to the National Association of Realtors. Barry and Larry take listener questions, including why they continue to invest i...

Bill Maher, RE/MAX Masters Millennium Realtor

Mar 25, 2021 Agents

Colorado Masters Radio

Bill Maher, RE/MAX Masters Millennium Realtor

Interview of Bill Maher, RE/MAX Masters Millennium Realtor. Maher talks about the collaborative atmosphere of RE/MAX Masters Millennium, why he now prefers residential real esate to commercial real esate, and the importance of the “work h...

Tom Ullrich, RE/MAX Masters Millennium Realtor Realtor

Mar 22, 2021 Agents

Colorado Masters Radio

Tom Ullrich, RE/MAX Masters Millennium Realtor Realtor

Interview of Tom Ullrich, RE/MAX Masters Millennium Realtor. Ullrich talks about the importance of following your fiduciary duty as a realtor, navigating the market when there’s little inventory, and the importance of giving back to the c...

Mar 20, 2021 Properties

Colorado Masters Radio

The Role of the Property Manager

Eugene O’Brien of RE/MAX Masters Property Management stops by to explain what a property manager does, and how they can lower the burden of wealth building through real estate. Barry, Larry, and Sherry discuss how new wealth builders can ...

Mar 20, 2021 Agents

Colorado Masters Radio

Tips for Finding New Properties

Barry, Larry, and Sherry discuss Larry’s current homeselling process, and why it it can be tiring emotionally and physically. Eugene O’Brien of RE/MAX Masters Property Management drops into the studio to provide tips to investors lookin...

Mar 13, 2021 Banks

Colorado Masters Radio

The Benefits of a Reverse Mortgage

Mike Rabon of Mortgage300 stops by the studio to talk about how wealth builders can use reverse mortgages to refinance or buy property. Barry, Larry, and Sherry talk about the types of returns wealth builders can anticipate when they use th...

Mar 13, 2021 Banks

Colorado Masters Radio

Explaining Reverse Mortgages

Mike Rabon of Mortgage300 stops by the studio to talk about the benefits of reverse mortgages. Barry, Larry, and Sherry discuss the importance of hiring an expert real estate agent to help guide homebuyers when a housing market lacks a plet...

Mar 6, 2021 Tips

Colorado Masters Radio

Ten Successful Tips for Wealth Building

Barry, Larry, and Sherry list out the ten successful tips for wealth building. They discuss all the research that investors need to do in advance of buying property to ensure they’re gettting the best return on their investments. The post...

Buying and Selling a Home at the Same Time

Mar 6, 2021 Buyers

Colorado Masters Radio

Buying and Selling a Home at the Same Time

Barry, Larry, and Sherry discuss the ins-and-outs of being a homebuyer and a homeseller at the same time, as Larry prepares to sell his home. They explain why the best real estate agents are the ones who never put pressure on their clients....

Feb 27, 2021 Banks

Colorado Masters Radio

What to Know About Delayed Financing

Del Van Essen of Community Banks Mortgage stops by to talk about how wealth builders can use such tactics as delayed financing to invest in multiple homes. Barry and Larry break down the Colarado Springs real estate market neighborhood-by-n...

Feb 27, 2021 Banks

Colorado Masters Radio

Working with Local Lenders

Del Van Essen of Community Banks Mortgage drops by the studio to talk about why it’s important to use local lenders when buying property. Barry, Larry, and Sherry discuss the unusual current lack of inventory in the Colorado housing marke...

Screening Tenant for Your Rental Property

Feb 20, 2021 Rental

Colorado Masters Radio

Screening Tenant for Your Rental Property

Eugene O’Brien of RE/MAX Masters Property Management stops by to offer advice on how to screen potential tenants. Barry, Larry, and Sherry discuss the importance of having a specific point person to help investors along during negotiation...

Feb 20, 2021 Colorado

Colorado Masters Radio

The Colorado Housing Market

Eugene O’Brien of RE/MAX Masters Property Management drops by the studio to forecast the housing market in both Colorado Springs and Denver. Barry, Larry, and Sherry discuss the downfalls consumers can face by relying too heavily on the i...

Putting Together the Right Wealth Building Team

Feb 13, 2021 Weatlh

Colorado Masters Radio

Putting Together the Right Wealth Building Team

Barry, Larry, and Sherry discuss why you should expect 100% loyalty from all members of your wealth building team. They list out the process new wealth builders can expect when they sign up with Vesterra Hot Spots. The post Putting Together...

Feb 13, 2021 Agents

Colorado Masters Radio

Roles of the Real Estate Agent

Barry, Larry, and Sherry discuss the roles of trustee and fiduciary that a real estate agent plays. They list out questions for consumers to ask prospective agents to ensure they live up to their fiduciary role. The post Roles of the Real E...

Feb 6, 2021 Consumers

Colorado Masters Radio

Bottomizing Your Risk

Barry, Larry, and Sherry discuss how real estate investors and wealth builders can bottomize risk. They explain all of the things investors need to look for before purchasing a property, like radon and deferred maintenance items, among othe...

Feb 6, 2021 Buyers

Colorado Masters Radio

Negotiating Real Estate Contracts

Barry, Larry, and Sherry discuss the various advantages and disadvantages that come with certain term-length contracts. They examine why many real estate agents are reluctant to write contracts that last over 180 days. The post Negotiating ...

Source: Colorado Masters Radio

Address	6020 Greenwood Plaza Boulevard Greenwood Village, CO 80111 USA
Email	arnie@arniestein.com

Arnie Stein

Realtor

Arnie Stein, REALTOR®

Arnie Stein

Contact Me

My Active Listings (3)

Denver, CO 80222

Denver, CO 80237

Denver, CO 80209

My Office Listings (704)

Florissant, Co 80816

Brighton, Co 80601

Denver, Co 80220

Parker, Co 80134

Denver, Co 80247

Watkins, Co 80137

Watkins, Co 80137

Colorado Springs, Co 8090

Elizabeth, Co 80107

Littleton, Co 80125

Johnstown, Co 80534

Thornton, Co 80602

Thornton, Co 80602

Thornton, Co 80602

Elizabeth, Co 80107

Aurora, Co 80016

Aurora, Co 80016

Johnstown, Co 80534

Johnstown, Co 80534

Johnstown, Co 80534

Johnstown, Co 80534

Loveland, Co 80538

Loveland, Co 80538

Loveland, Co 80538

Podcast from Colorado Masters Radio