Proxicast Coaxial Lightning Arrester/Suppressor with PL-259 & SO-239 (M/F) Connectors - Pro-Grade Coax Cable Surge Protector for HF, VHF, UHF, CB, Ham, Two-Way Radio and Other Antennas (ANT-234-002). CONNECT COAXIAL SURGE PROTECTOR to Antenna Signal Feedline and Earth Ground.