This does not "plug in" to the radio in the conventional sense. It is inserted into the antenna line. In other words, you disconnect the antenna from the car's radio, connect the antenna to this device, and then connect this device to the radio into the jack where the antenna attaches. It also has a third wire that connects to the "FM" jack on the satellite radio's base. So you have to have access to the rear of the car's radio, which could mean removing it from the dash or at least removing the trim around the radio. You're going to want to hide this thing behind the radio. You're also going to have a wire coming out of the dash to connect to the satellite radio.