Para Dynamics PDC634MB AM/FM SCANNER ANTENNA WITH BNC ADAPTER MULTICOUPLER Use your car's AM/FM antenna on your scanner or wideband receiver This device handles signals from 25 to 900 MHz One output cable to the Motorola plug is 9 inches long The other output cable to the Motorola plug is 24 inches long GM and some other makes of vehicles require an optional adapter that can be purchased at many local car parts stores. (PDC634MB works with vehicle radios that use a standard type Motorola connector). Check your vehicles owner manual for the type of connector used on your music radio.