OK, HERE IS SOME HELPFUL INFO. IF YOU INSTALL A AFTERMARKET RADIO WITH AFTERMARKET XM TUNER 98% OF SHOPS WILL TELL YOU YOU CAN NOT USE THE FACTORY ANTENNA.....WRONG..... ALL YOU HAVE TO DO IS REMOVE THE PLASTIC FROM THE CONNECTOR AND IT WILL PLUG RIGHT IN. I HAVE A 2007 SILVERADO. HOPE THIS HELPS SOMEONE