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Metra 40-VW21 Antenna Adapter

Works with select 1986-up vehicles (OEM male to Motorola antenna female)

Item #: 12040VW21

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7 Reviews | Ask Questions

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Volkswagen uses a non-standard jack on its antenna cables, which can create a problem when you want to replace a broken antenna or connect an FM modulator to your system. This simple in-line adapter has a standard female Motorola antenna jack on one end, and a male Volkswagen/Audi plug on the other. Just connect your antenna cable to the adapter, plug it into your Volkswagen radio, and you're good to go. Warranty: 60 days.

If you're adding an FM modulator to your factory stereo, a second adapter is also required. One adapter will connect to your factory stereo, while the second connects to your factory antenna cable. Your FM modulator installs inline between the two adapters.

Metra 40-VW21 Antenna Adapter Reviews

Average Customer Review:

7 Reviews

Metra 40-VW21 Antenna Adapter

Written by: Anonymous from Westfield, MA on October 21, 2014

Item didn't fit

Pros: None

Cons: Wrong item doesn't fit my application

Crutchfield response on October 27, 2014 We forwarded this review to our Technical Support team for follow-up. Lifetime tech support comes with every Crutchfield purchase.

Euro Antenna Adapter

Written by: ChrisG from Clarkston, MI on September 24, 2014

Crutchfield Customer Review (What's this?)

Used this to connect German Becker radio to Chrysler Crossfire antenna. Very compact and easy installation.

Pros: Very small, doesn't add any bulky cables. Great price and fast, free shipping.

Cons: None

antenna adapter bb

Written by: bob from ia on August 12, 2014

Crutchfield Customer Review (What's this?)

did not fit aplication




Written by: HappyCamper from Dallas, TX on May 28, 2014

2005 Mercedes-Benz ML350
Crutchfield Customer Review (What's this?)

Great Price, free shipping.

Pros: Does what I need.

Cons: none

Antenna Adapter

Written by: Abs from San Jose, CA on July 12, 2013

2000 Mercedes-Benz C-Class
Crutchfield Customer Review (What's this?)

The Antenna Adapter worked well with my vehicle and new stereo. The ordering of the product was easy and the delivery of the product was prompt. Thank You Crutchfield.



You never know where you might need this

Written by: Rich from Chicago, IL on November 8, 2012

2005 Mazda 6
Crutchfield Customer Review (What's this?)

Needed this in order to plug a universal cable into the antenna base of a Mazda 6.

Pros: Works as expected. Not just for Volkswagens.


Works on a 99 Saab 9-3

Written by: John from Huntsville, AL on November 12, 2008

1999 Saab 9-3
Crutchfield Customer Review (What's this?)

After searching high and low to find a way to connect my FM direct connector from my Sirius Sat Radio to my factory installed radio, I found this adapter. Very easy to use and connect.



Hands-on research

What's in the box?

Download owner's manual

  • VW/Audi/European vehicle antenna adapter

Product Research


Compatibility: The Metra AntennaWorks VW/Audi/European vehicle antenna adapter (40-VW21) converts the OEM antenna connection of  an1988-up VW/Audi/European factory radio to a standard motorola plug when replacing the factory flat antenna with an aftermarket antenna.

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