
Customers enjoy this antenna adapter, citing its compatibility with various GM vehicles and its ease of installation. Positive feedback highlights its ability to improve Bluetooth and satellite radio functionality, while also praising its excellent fit and reasonable price. Many reviewers found it essential for completing audio installations. The adapter receives high marks for its performance and value.
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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 adapter allows you to adapt an aftermarket antenna to your OEM radio in select 1988 - 2006 GM vehicles.

Ensure USB-enabled devices have a reliable connection with this Install Bay female USB 3.0 Type-A to male USB 3.0 Type-A adapter. The universal design enables a snug fit in multiple mounting options, while the oxygen-free copper conductor allows for maximum signal transfer.

Enjoy virtually static-free sound with this SiriusXM FM direct adapter, which provides a high-performance wired audio connection to your vehicle's radio. You can still listen to your local AM and FM stations when your Satellite Radio is turned off. Compatible with most SiriusXM, XM and Sirius radio models with a PowerConnect Vehicle Kit.
| Pros for Metra - Antenna Adapter for Select 1985-2013 Chevrolet GMC Hyundai Kia Buick Cadillac Pontiac - Black | |||
|---|---|---|---|
| Compatibility, Fit, Installation, Antenna Adapter, Price | Installation, Compatibility, Reception, Ease of use, Fit | There were no pros for this product— | Installation, Ease of use, Reception, Sound Quality, Signal Strength |
| Cons for Metra - Antenna Adapter for Select 1985-2013 Chevrolet GMC Hyundai Kia Buick Cadillac Pontiac - Black | |||
| There were no cons for this product— | Static, Signal | There were no cons for this product— | Static, Compatibility |