This adapter allows you to adapt an aftermarket antenna to your OEM radio in select 1988 - 2006 GM vehicles.
Q: What does this antenna adapter connect to?
A: This adapter allows you to connect an aftermarket antenna to your OEM radio in select GM vehicles.
Q: What is this antenna adapter made of?
A: This antenna adapter is made of copper, polypropylene, and steel.
Q: Does this antenna adapter come with any warranty?
A: Yes, this product comes with a 1-year warranty for both parts and labor.
Q: How many adapters are included in the package?
A: This product comes with one antenna adapter.
Q: What is the length of this antenna adapter?
A: This antenna adapter is 14-1/4" long.
Q: Where does it mount on a 2004 Chevy SSR?
A: That is an adapter for your antenna. When you pull your old radio out the car antenna should be connected to the back of it. Pull out the antenna and plug it to the adapter and the adapter goes to the new radio.
Q: does it fit to a 2010 chevy silverado
A: undefined
Q: Will this work for a 05 suburban
A: undefined
Customers are pleased with the Antenna Adapter, highlighting its easy installation, compatibility with various models, and resulting good radio reception. Users appreciate the adapter's ease of use, perfect fit, and overall performance. Some customers have noted the absence of static, which is a common issue with other similar products. The adapter is also considered a great value for its price.
The vast majority of our reviews come from verified purchases. Reviews from customers may include My Best Buy members, employees, and Tech Insider Network members (as tagged). Select reviewers may receive discounted products, promotional considerations or entries into drawings for honest, helpful reviews.

This adapter allows you to adapt an aftermarket antenna to your OEM radio in select 1988 - 2006 GM vehicles.

This Metra 40-GM21 adapter lets you connect an aftermarket antenna to your compatible 1998-2008 GM vehicle's factory-installed radio. Copper, polypropylene and steel materials and copper shielding provide durability.

This aftermarket antenna adapter is designed for use with most 1988-2006 GM vehicles and features copper, polypropylene and steel materials for durability.
| Pros for Metra - Antenna Adapter for Select 1985-2013 Toyota Chevrolet GMC Hyundai Kia Buick Cadillac - Black | |||
|---|---|---|---|
| Installation, Compatibility, Fit, Reception, Ease of use | Compatibility, Installation, Overall Performance, Fit, Radio | Overall Performance, Fit, Compatibility, Installation Ease | There were no pros for this product— |
| Cons for Metra - Antenna Adapter for Select 1985-2013 Toyota Chevrolet GMC Hyundai Kia Buick Cadillac - Black | |||
| Static | There were no cons for this product— | There were no cons for this product— | There were no cons for this product— |