Turn any FM radio into a satellite radio! This FM transmitter cable allows any Sirius satellite radio Plug & Play type receiver to be directly connected to any FM radio. The small 2.5mm plug is connected to the FM out jack on the satellite receiver. The FM radio antenna cable is removed from the back of the radio, the male Motorola connector of the transmitter bypass is plugged into the radio and the truck antenna is plugged into the female Motorola connector of the bypass. The FM radio and the FM modulator of the satellite receiver must be tuned to the same frequency.