** THIS ADAPTER IS USED WHEN REPLACING OEM STOCK RADIO TO AN AFTERMARKET STEREO ** PLUGS DIRECTLY INTO CARS OEM ANTENNA SOCKET AND THEN INTO THE NEW (AFTERMARKET) STEREO ** Radio Antenna Adapters are usually Required when Installing an aftermarket stereo for the first time ** No Cutting or Wiring Needed - Plug N Play connection (no experience necessary) ** Allows AM/FM Radio to still work w/ After market Antenna ** Connects the factory antenna cable to any aftermarket receiver **KEEPS YOUR EXISTING ANTENNA FUNCTIONING WITH YOUR NEW STEREO ** USUALLY A REQUIRED INSTALL PART IF FM RADIO IS TO BE MAINTAINED ** Simply plug into the back of new aftermarket radio and then into original Antenna wire plug