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Metra 40-GM20 Antenna Adapter

Works with select 1985-up General Motors vehicles — factory male to female Motorola antenna connector

Item # 12040GM20

The Metra 40-GM20 adapter lets you connect an aftermarket antenna cable to the factory radio.

Find what Fits your car

The Metra 40-GM20 adapter lets you connect an aftermarket antenna cable to the factory radio.

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Item # 12040GM20

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$7.99
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About the Metra 40-GM20 Antenna Adapter

Metra 40-GM20 adapter

The Metra 40-GM20 adapter lets you connect an aftermarket antenna cable to the factory radio. It has an OEM male plug on one end and a Motorola female jack on the other. You'll also need item 12040GM10 if you're installing a wired FM modulator with your factory radio. Please enter your vehicle information or call an Advisor at 1-888-955-6000 to find out if this adapter is compatible with your vehicle. Warranty: 60 days.

Metra 40-GM20 adapter

The Metra 40-GM20 adapter lets you connect an aftermarket antenna cable to the factory radio. It has an OEM male plug on one end and a Motorola female jack on the other. You'll also need item 12040GM10 if you're installing a wired FM modulator with your factory radio. Please enter your vehicle information or call an Advisor at 1-888-955-6000 to find out if this adapter is compatible with your vehicle. Warranty: 60 days.

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What's in the box:

MFR #40-GM20

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Metra 40-GM20 Antenna Adapter reviews

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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 purchase (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

Crutchfield response on

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?)
Verified employee purchase (What's this?)

Part worked as expected on an 05 GMC Sierra.

Pros: Excellent price and fast shipping!!!

Cons: None

Crutchfield response on

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 purchase (What's this?)

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

Pros:

Cons:

Crutchfield response on

0 of 0 found this helpful

Metra 40-GM20 Antenna Adapter

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

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

Everything I have purchased has been as described.

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

Cons: none

Crutchfield response on

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 purchase (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 purchase (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

Crutchfield response on

0 of 0 found this helpful

Of course it fits

Cookie from MA. on 12/7/2013

2006 Chevrolet Cobalt

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

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

Pros:

Cons:

Crutchfield response on

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

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

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

Pros: easy install

Cons: none

Crutchfield response on

0 of 0 found this helpful

Just what I needed

Charlie from Hagerstown,Maryland on 4/25/2009

1989 Chevrolet C Series

Verified customer (What's this?)
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Did just what it was made for.

Pros:

Cons:

Crutchfield response on

0 of 1 found this helpful

Just right

Charles from Sacramento, CA on 2/17/2009

1998 Cadillac Eldorado

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

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

Pros:

Cons:

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More details on the Metra 40-GM20 Antenna Adapter

Product Research

Features

Compatibility: The Metra AntennaWorks GM antenna adapter cable (40-GM20) converts the mini "barbed" or "barbless" antenna plug of a 1985-up GM factory radio to a standard motorola connection for installation of an aftermarket antenna in select 1985-up GM vehicles.

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Customer Q&A

Q
Crutchfield asked: Why did you buy this?
A
I need to hook my factory GM antenna to my aftermarket radio. The description on this product stated that it allows you tut o do so. Never had any issues with Crutchfield pertaining to their knowledge of the products they sell. [ Arlindo  Mar 30, 2019 ]
A
Because it wasn't included with the tuner that fits my car. It should have been offered just like the installation kit, speakers etc that fit my particular vehicle. Maybe it's just me but I didn't see it as a choice when checking out. Shipping should have been free [ JACK  Nov 06, 2017 ]
A
Advised as needed [ John  Oct 06, 2017 ]
A
Recommend for proper fit. [ Bobby  May 01, 2017 ]
A
Great easy install. [ DONALD  May 11, 2016 ]
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1 question already asked

Q
I want to be sure my factory antenna (1995 Silverado k1500) will match up to my new pioneer double DIN with the adapter?
[ Giancarlo  Jul 28, 2019 ]
1 answer
A
My vehicle is a 1994 Pontiac Firehawk. With with the antenna adapter I was able to add in the aftermarket components with no problems.
[ George  Jul 29, 2019 ]

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