Shakespeare AM/FM Cable Marine Electronic Accessory - Shakespeare utilizes low loss cable for a number of extension and other antenna cable needs – from cable kits for the Phase III line of antennas, to extension cables for VHF and AM/FM, and SiriusXM antennas, as well as jumper cable for the ART-3 antenna tester and raw RG-8X cable for any coax needs. TIP: Be sure to thoroughly review all Shakespeare antenna instruction sheets as some supplied cables may not be cut or altered.