** PLUGS DIRECTLY INTO CARS OEM ANTENNA SOCKET AND THEN INTO THE NEW (AFTERMARKET) STEREO ** Plug N Play connection ** Allows AM/FM Radio to still work w/ After market Antenna ** Connects to any aftermarket receiver . Designed for a SIERRA 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006