Eliminate static and FM Interference with the FM Direct Adapter. It directly connects to the the FM output on car docks to the FM antenna of your vehicle. As a result, nearly all static is eliminated. Works with almost every Sirius and SiriusXM Docking station and many of the newer XM Docking Stations. Just check to see if your Car Docking Station has an "FM Out" port to insure compatibility. Features: •Eliminates Static and improves sound quality vs FM Transmission •No need to change FM Frequencies to find a good signal Note: •The FM DIRECT ADAPTER will disable your ability to listen to FM/AM stations while your Satellite Radio is 'turned on'. You MUST TURN OFF your Satellite Radio to listen to local FM/AM stations. FM Direct Adapter for Satellite Radios with an "FM Out" Port, some of which are: Stratus, Stratus 4, Stratus 5, Stratus 6, Stratus 7. Starmate 3, Starmate 4, Starmate 5, Starmate 8. Sportster 5. XMxpressRCI XM Onyx SiriusXM Edge XM Onyx EZ XM Snap for Vehicle You can use Amazon's Car Stereo Application Guide to determine if your GM vehicle needs the set of antenna adapters included in this set.