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1-800-297-9469

Our hours

Monday-Friday:
9 AM - 6 PM ET
Looking for International Support?
Connect ID #
076 728 741

Shop smart & save time when you connect with an advisor

1.
Call us at 1-800-297-9469
2.
Mention Connect ID number:
076 728 741
3.
Your advisor will be able to share relevant pages and add items to your cart
Your security and privacy are ensured. Our advisors cannot see anything that is on your computer. They only have the ability to "serve" a page from our site and put items in your cart. You’re in control at all times, and you can disconnect at any time by closing your browser window.
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Customer Reviews

Metra 40-GM20 Antenna Adapter

Metra 40-GM20 Antenna Adapter Works with select 1985-up General Motors vehicles — factory male to female Motorola antenna connector

MFR # 40-GM20

4.5 out of 5 stars
21 reviews
View this product
Metra 40-GM20 Antenna Adapter

Gregory from Fayetteville, NC on 6/10/2024

2004 Chevrolet Impala

Verified customer (What's this?)
Verified employee review (What's this?)

I checked with all the local automotive parts stores here in town for this part to no avail. Only one ever sold it and they where out of stock with no plans to reorder because of such small need by their customers. Your product was just what I needed, and at a good price. I ordered it on a Wednesday afternoon and was shocked that it was delivered on Friday as I was told it would be. I do not have much need for parts often, but will do business with Crutchfield in the future.

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0 of 0 found this helpful

Antenna Adapter for C5 Corvette Factory Radio

Anthony from Bonita Springs, FL on 5/30/2024

2000 Chevrolet Corvette

Verified customer (What's this?)
Verified employee review (What's this?)

Needed this hard to find antenna adapter for my C5 corvettes factory radio. Crutchfield had it!! Was shipped out immediately.Highly recommend Crutchfield for your parts!

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0 of 0 found this helpful

Metra 40-GM20 Antenna Adapter

George from Scituate, MA on 1/17/2024

Verified customer (What's this?)
Verified employee review (What's this?)

This cable is of good quality and fit. Crutchfield got it to me fast too! Needed it to connect to an iSimple ISFM2381 Blue Connect Bluetooth for an old Corvette. The unit only does Bluetooth for the phone and streaming music, but when connected the FM radio plays only white noise static! If you are on FM radio and a call comes in you'd have to pull over and connect the Bluetooth-??

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0 of 0 found this helpful

Metra 40-GM20 Antenna Adapter

Justin from Yakima, WA on 8/30/2022

1990 Buick Reatta

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Verified employee review (What's this?)

Great quality, excellent price and fast shipping! Thank you Crutchfield!

Pros: Great quality and fit!

Cons: None

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0 of 0 found this helpful

Metra 40-GM20 Antenna Adapter

Lynne N from Gum Spring, VA on 2/3/2022

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It has improved the signal, I can't say it made everything better. Will have to give it more time

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0 of 0 found this helpful

Metra 40-GM20 Antenna Adapter

Crutchfield customer from Pocasset, MA on 7/23/2021

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Simple and easy. Gave just that little extra length

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0 of 0 found this helpful

Great product

Crutchfield customer from Center Cross, VA on 6/28/2021

2004 Hyundai Santa Fe

Verified customer (What's this?)
Verified employee review (What's this?)

Perfect fit. The Mertra product are high quality and never have a problem with them.

Pros: Works as described.

Cons: None

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0 of 0 found this helpful

Metra 40-GM20 Antenna Adapter

Crutchfield customer from Brighton, TN on 2/8/2021

2003 Chevrolet TrailBlazer

Verified customer (What's this?)
Verified employee review (What's this?)

Plug did not fit the radio. Adapter and stock antenna plug ends are same size.

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1 of 1 found this helpful

Metra 40-GM20 Antenna Adapter

Crutchfield customer from Isabela, PR on 12/16/2020

1995 Chevrolet S10

Verified customer (What's this?)
Verified employee review (What's this?)

Excelente . Cumple con el propósito Excellent Meets the purpose

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Crutchfield response on 12/22/2020
Translation provided by Crutchfield's International Sales and Support team.

0 of 0 found this helpful

Metra 40-GM20 Antenna Adapter

Crutchfield customer from Santa Fe, NM on 3/7/2020

1995 Chevrolet Camaro

Verified customer (What's this?)
Verified employee review (What's this?)

works great. easy to install especially with the instructions specific for my car.

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0 of 0 found this helpful

Metra 40-GM20 Antenna Adapter

Crutchfield customer from Springtown, TX on 1/20/2020

1994 GMC Yukon

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Verified employee review (What's this?)

Good quality and I'm sure it would work well with the correct application

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0 of 0 found this helpful

Metra 40-GM20 Antenna Adapter

Crutchfield customer from Milwaukee, WI on 6/25/2019

1995 Oldsmobile Cutlass Supreme

Verified customer (What's this?)
Verified employee review (What's this?)

I needed an antenna for a 95 plus and crutchfield tried to help me out. The antenna I received worked but the electrical element if it does not. In other words it doesn't go up or down by power. But st least I have an antenna

Pros: I can listen to music

Cons: I'm afraid to go through car wash !! Or that someone's going to snap it

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0 of 0 found this helpful

As described

Kcots99 from Christiana, TN on 3/5/2019

2005 GMC Sierra 1500

Verified customer (What's this?)
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Part worked as expected on an 05 GMC Sierra.

Pros: Excellent price and fast shipping!!!

Cons: None

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?
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0 of 0 found this helpful

Metra 40-GM20 Antenna Adapter

Crutchfield customer from Dallas, GA on 8/13/2016

1990 Buick Reatta

Verified customer (What's this?)
Verified employee review (What's this?)

Perfect.... Does exactly what its supposed to. Love having my SiriusXM Stratus 6 Radio in our 1990 Buick.

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0 of 0 found this helpful

Metra 40-GM20 Antenna Adapter

JimR from Mission Viejo, Ca on 6/21/2014

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Everything I have purchased has been as described.

Pros: Had in stock and received in a timely fashion. Great service.

Cons: none

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?
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0 of 0 found this helpful

Antenna Adapter

thedudeabides80 from Mount Sterling IL on 5/4/2014

1994 Oldsmobile Cutlass Supreme

Verified customer (What's this?)
Verified employee review (What's this?)

The price was nice and the quality of the product was great. BUT I was installing this in a 94 olds cutlass supreme and the factory antennae wire has a bend in it and would not fit correctly into this adapter, I had to go guy another adapter to fit into this one which fit into the stereo just fine, If your antennae wire has the factory bent end on the wire I would explore other options.

Pros: Great quality, price

Cons: will not accept factory bend antenna wire.

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0 of 0 found this helpful

Metra 40-GM20 Antenna Adapter

TX454SS from Houston, TX on 5/2/2014

Verified customer (What's this?)
Verified employee review (What's this?)

This adapter quickly and easily connected the OEM antenna coax in my 1990 Chevy 1500 to my newly installed Sony sound system.

Pros: Quick and easy

Cons: None

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0 of 0 found this helpful

Of course it fits

Cookie from MA. on 12/7/2013

2006 Chevrolet Cobalt

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As with everything I purchase from Crutchfield, it is just the right part.

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0 of 0 found this helpful

Adapter worked great with auxilary fm input unit...very pleased

Charles from Jeffersonville,In. on 7/29/2013

2006 Buick LaCrosse

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Verified employee review (What's this?)

Adapter worked great with auxilary fm input unit...very pleased. Super support!

Pros: easy install

Cons: none

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?
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0 of 0 found this helpful

Just what I needed

Charlie from Hagerstown,Maryland on 4/25/2009

1989 Chevrolet C Series

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Did just what it was made for.

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0 of 1 found this helpful

Just right

Charles from Sacramento, CA on 2/17/2009

1998 Cadillac Eldorado

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This piece of cable did exactly what it was made to do.

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