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Metra 40-GM20 Antenna Adapter

Connect your factory antenna to a new aftermarket radio for select 1958-2024 vehicles from Chevrolet, GMC, Pontiac

Metra
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• Factory Radio with Mini "Barbed" Connector to Aftermarket Antenna Adapter
• select 1958-2024 vehicles from Chevrolet, GMC, Pontiac Vehicles

See compatible vehicles Learn more about the met-40gm20
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Fits your 2004 Astro

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List price $7.99
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-13%

$6.99

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Description


Metra brand icon

Authorized dealer

General Features:

Equivalent to: Scosche MDARB & American International GM-7

Compatible Vehicles:

  • Buick
    • 2004 - 2005 Century
    • 1997 - 2003 Century
    • 1990 - 1996 Century
    • 1988 - 1989 Century
    • 1990 - 1990 Electra
    • 1988 - 1989 Electra
    • 2005 - 2009 LaCrosse/ Allure
    • 1988 - 1999 Le Sabre
    • 1988 - 2005 Park Avenue
    • 2004 - 2007 Rainier
    • 1990 - 1991 Reatta
    • 1988 - 1989 Reatta
    • 2000 2004 Regal
    • 1995 - 1999 Regal
    • 1988 - 1994 Regal
    • 2002 - 2007 Rendezvous
    • 1996 - 1999 Riviera
    • 1990 - 1995 Riviera
    • 1986 - 1989 Riviera
    • 1995 - 1996 Roadmaster
    • 1991 - 1994 Roadmaster
    • 1996 - 1998 Skylark
    • 1987 - 1995 Skylark
    • 1988 - 1989 Skyhawk
    • 2005 - 2008 Terraza
  • Cadillac
    • 1990 - 1992 Brougham
    • 1987 - 1989 Brougham
    • 1997 - 2001 Catera
    • 1990 - 1993 Coupe DeVille
    • 1988 - 1989 Coupe DeVille
    • 2000 - 2005 DeVille
    • 1996 - 1999 DeVille (column shift)
    • 1996 - 1999 DeVille (console shift)
    • 1994 - 1995 DeVille
    • 1994 - 1995 DeVille Concours
    • 1990 - 1993 DeVille
    • 1988 - 1989 DeVille
    • 2000 - 2002 Eldorado
    • 1996 - 1999 Eldorado
    • 1994 - 1995 Eldorado (console shift)
    • 1992 - 1993 Eldorado (console shift)
    • 1988 - 1991 Eldorado
    • 2003 - 2006 Escalade (ESV and EXT included)
    • 1999 - 2002 Escalade (ESV and EXT included)
    • 1993 - 1996 Fleetwood (including Brougham)
    • 1990 - 1992 Fleetwood (not Brougham)
    • 1990 - 1992 Fleetwood Brougham
    • 1988 - 1989 Fleetwood
    • 2002 - 2004 Seville
    • 1997 - 2001 Seville
    • 1997 - 1997 Seville
    • 1996 - 1996 Seville
    • 1994 - 1995 Seville (console shift)
    • 1992 - 1993 Seville (console shift)
    • 1988 - 1991 Seville
  • Chevrolet
    • 1996 - 2005 Astro Van
    • 1991 - 1995 Astro Van
    • 1985 - 1990 Astro Van
    • 2003 - 2006 Avalanche
    • 2002 - 2002 Avalanche
    • 1991 - 1996 Beretta
    • 1988 - 1990 Beretta (AC)
    • 1988 - 1990 Beretta (NON-AC)
    • 1992 - 1994 Blazer (Full Size)
    • 2003 - 2005 Blazer
    • 2002 - 2002 Blazer With Double-DIN Radio
    • 2002 - 2002 Blazer With DIN & 1/2 Radio
    • 1998 - 2001 Blazer
    • 1997 - 2002 Camaro
    • 1993 - 1996 Camaro
    • 1990 - 1992 Camaro
    • 1994 - 1996 Caprice
    • 1991 - 1993 Caprice
    • 2001 - 2005 Cavalier
    • 2000 - 2000 Cavalier
    • 1995 - 1999 Cavalier
    • 1991 - 1994 Cavalier
    • 1988 - 1990 Cavalier
    • 1990 - 1990 Celebrity
    • 2005 - 2006 Cobalt
    • 2004 - 2011 Colorado
    • 1991 - 1996 Corsica
    • 1988 - 1990 Corsica (AC)
    • 1988 - 1990 Corsica (NON-AC)
    • 2005 - 2011 Corvette
    • 1999 - 2004 Corvette
    • 1997 - 1998 Corvette
    • 1990 - 1996 Corvette
    • 1984 - 1989 Corvette
    • 2005 - 2006 Equinox
    • 1996 - 2007 Express van (full size)
    • 2000 - 2005 Impala
    • 1994 - 1996 Impala SS
    • 1995 - 2001 Lumina
    • 1990 - 1994 Lumina
    • 1993 - 1996 Lumina APV
    • 1990 - 1992 Lumina APV
    • 2008 - 2008 Malibu Classic
    • 2004 - 2007 Malibu/ Malibu Maxx
    • 2001 - 2003 Malibu
    • 2004 - 2005 Malibu Classic
    • 1997 - 2000 Malibu
    • 2000 - 2005 Monte Carlo
    • 1995 - 1999 Monte Carlo
    • 1995 - 2000 CK Pickup (01-up see Silverado)
    • 1988 - 1994 CK Pickup (Full Size)
    • 1995 - 1997 S-10 Blazer (98-up see Blazer)
    • 1990 - 1994 S-10 Blazer
    • 1988 - 1989 S-10 Blazer
    • 2003 - 2004 S-10 Pickup
    • 2002 - 2002 S-10 Pickup With Double-DIN Radio
    • 2002 - 2002 S-10 Pickup With DIN & 1/2 Radio
    • 1998 - 2001 S-10 Pickup
    • 1994 - 1997 S-10 Pickup
    • 1989 - 1993 S-10 Pickup
    • 2007 - 2007 Silverado Pickup Classic
    • 2003 - 2006 Silverado Pickup (all models)
    • 1999 - 2002 Silverado Pickup
    • 2003 - 2006 SSR
    • 2003 - 2006 Suburban
    • 2000 - 2002 Suburban
    • 1995 - 1999 Suburban
    • 1992 - 1994 Suburban
    • 1988 - 1991 Suburban
    • 2003 - 2006 Tahoe
    • 1995 - 2002 Tahoe
    • 1998 - 2004 Tracker
    • 2002 - 2009 Trailblazer
    • 2005 - 2008 Uplander
    • 2003 - 2007 Van (full size) Express
    • 2001 - 2002 Van (full size) Express
    • 1996 - 2000 Van (Full Size) Express
    • 1988 - 1995 Van (Full Size)
    • 2000 - 2005 Venture Van
    • 1997 - 1999 Venture Van
  • GMC
    • 2004 - 2011 Canyon
    • 2003 - 2003 Denali
    • 2002 - 2009 Envoy
    • 1998 - 2001 Envoy
    • 1998 - 2001 Jimmy / Envoy
    • 1995 - 1997 Jimmy
    • 1994 - 1994 Jimmy
    • 1988 - 1991 Jimmy (Full Size)
    • 2007 - 2007 Sierra Classic
    • 2003 - 2006 Sierra
    • 1995 - 1998 Sierra
    • 1988 - 1994 Sierra
    • 2003 - 2007 Savana Full Size Van
    • 2001 - 2002 Savana Full Size Van
    • 1996 - 2000 Savana Full Size Van
    • 2003 - 2004 Sonoma
    • 2002 - 2003 Sonoma With Double-DIN Radio
    • 2002 - 2002 Sonoma With DIN & 1/2 Radio
    • 1998 - 2001 Sonoma
    • 1994 - 1997 S-15/Sonoma
    • 1993 -1993 S-15/Sonoma
    • 1986 - 1992 S-15/Sonoma
    • 1996 - 2005 Safari Mini Van
    • 1991 - 1995 Safari Mini Van
    • 1985 1990 Safari Mini Van
    • 1988 - 1999 Suburban
    • 2003 - 2006 Yukon / Yukon XL
    • 1995 - 2006 Yukon / Denali
    • 2001 - 2002 Yukon XL
    • 1992 - 1994 Yukon
  • Hummer
    • 2004 - 2007 H2
    • 2003 - 2003 H2
    • 2006 - 2010 H3
  • Hyundai
    • 2003 - 2006 Santa Fe w/ Monsoon
  • Isuzu
    • 2003 - 2008 Ascender
    • 1998 - 2001 Hombre
  • Kia
    • 2003 - 2006 Sorento EX
    • 2003 - 2006 Sorento LX with Sport Package
  • Oldsmobile
    • 1996 - 1998 Achieva
    • 1993 - 1995 Achieva
    • 1992 - 1992 Achieva
    • 2001 - 2004 Alero
    • 1999 - 2000 Alero
    • 1995 - 2000 Aurora
    • 2002 - 2004 Bravada
    • 1998 - 2001 Bravada
    • 1995 - 1997 Bravada
    • 1991 - 1994 Bravada
    • 1997 - 1999 Cutlass
    • 1988 - 1991 Cutlass Calais
    • 1988 - 1996 Cutlass Ciera
    • 1988 - 1997 Cutlass Supreme
    • 1988 - 1999 Eighty-Eight
    • 2002 - 2002 Intrigue
    • 1998 - 2001 Intrigue
    • 1996 - 1999 LSS
    • 1994 - 1996 Ninety-Eight
    • 1989 - 1993 Ninety-Eight
    • 1988 - 1988 Ninety-Eight
    • 1997 - 1998 Regency
    • 1997 - 1999 Silhouette
    • 1993 - 1996 Silhouette APV
    • 1990 - 1992 Silhouette APV
    • 1988 - 1990 Touring Sedan
    • 1988 - 1993 Toronado
    • 1983 - 1987 Toronado
  • Pontiac
    • 1990 - 1991 6000
    • 1988 - 1989 6000
    • 1986 - 1987 6000
    • 2001 - 2005 Aztec
    • 1994 -1999 Bonneville
    • 1992 - 1993 Bonneville
    • 1987 -1989 Bonneville Safari Wagon
    • 1993 - 2002 Firebird/Trans AM
    • 1990 - 1992 Firebird/Trans AM
    • 1988 - 1989 Firebird/Trans AM
    • 2005 - 2008 G6
    • 2001 - 2005 Grand Am
    • 1996 - 2000 Grand AM
    • 1992 - 1995 Grand AM
    • 1990 - 1991 Grand AM
    • 1988 - 1989 Grand AM
    • 2004 - 2008 Grand Prix
    • 1994 - 2003 Grand Prix
    • 1992 - 1993 Grand Prix
    • 1990 -1991 Grand Prix
    • 1988 - 1989 Grand Prix
    • 1988 - 1993 Lemans
    • 2006 - 2007 Montana SV6 (Canada)
    • 2005 - 2005 Montana SV6
    • 2005 - 2005 Montana (non SV6)
    • 2000 - 2004 Montana
    • 1999 - 1999 Montana Mini Van
    • 1989 - 1994 Sunbird
    • 1988 - 1988 Sunbird
    • 2000 - 2005 Sunfire
    • 1995 - 1999 Sunfire
    • 2006 - 2006 Torrent
    • 1997 - 1999 Trans Sport
    • 1990 - 1996 Trans Sport APV
    • 2003 - 2008 Vibe
  • Saab
    • 2005 - 2009 9-7x
  • Saturn
    • 1991 - 1994 Saturn Sport Coupe
    • 1995 - 1999 Saturn
    • 2005 - 2007 Relay
  • Toyota
    • 2005 - 2008 Matrix
    • 2003 - 2004 Matrix

Compatible Vehicles


Please use our Fitment Guide to determine specific compatibility for the submodel and audio features


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5
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6.8" Double DIN Touchscreen Digital Multimedia Receiver with Bluetooth, Apple CarPlay, Android Auto, and SiriusXM Ready

2
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Alpine iLX-W650

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123
-5.72%

$329.95

List price $349.95

DMH-W4660NEX main

Pioneer DMH-W4660NEX

6.8" Double DIN Digital Multimedia Receiver with Bluetooth, Wireless Apple CarPlay, and Android Auto (SiriusXM Ready)

2
-20.00%

$599.99

List price $750.00

CV15BT main

Cerwin-Vega CV15BT

Single Din Digital Media Receiver with Bluetooth

3
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43
-16.69%

$149.95

List price $180.00

Limited time!
DMX709S main

Kenwood eXcelon DMX709S

6.8" Double DIN Touchscreen Digital Multimedia Receiver with Bluetooth, Apple CarPlay, Android Auto (Sirius XM Ready)

20
-33.50%

$399.00

List price $600.00

Limited time!
XAV-AX8500 main

Sony XAV-AX8500

10.1" Single DIN Floating Touchscreen Digital Multimedia Receiver with Bluetooth, Wireless Apple CarPlay, and Wired Android Auto (SiriusXM Ready)

2
-20.20%

$798.00

List price $999.99

DEH-S7200BHS main

Pioneer DEH-S7200BHS

Single DIN CD Receiver with Bluetooth, HD Radio and SiriusXM Ready

2
-10.72%

$249.99

List price $280.00

AVH-2550NEX main

Pioneer AVH-2550NEX

6.8" Double DIN Touchscreen DVD Receiver with Bluetooth, Apple CarPlay, and Android Auto (SiriusXM Ready)

-13.33%

$650.00

List price $750.00


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Item Details


Manufacturer:

Model Number:

40-GM20

Weight:

0.50lbs

Internal SKU:

met-40gm20

Internal Product ID:

12834

Customer Ratings & Reviews


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Modern vehicles often require specific brackets, wiring harnesses, and mounting solutions. A fit guide ensures:

  • You see only parts engineered for your exact vehicle
  • You avoid incompatible radios, speakers, or wiring
  • Installation is smoother, faster, and frustration-free
  • You get the correct accessories the first time

Whether you're replacing a factory stereo or upgrading your entire audio system, the Fit Finder eliminates uncertainty.