PolyPhaser coaxial RF surge protector (also known as lightning surge protector, lightning surge arrestor or suppressor) VHF50B43-MA-BD is in-stock and will ship same-day as purchased. This radio frequency surge protector / lightning surge arrestor helps protect your equipment from electromagnetic pulse (EMP) or power surges that are commonly caused by lightning or other strong electrical changes. Our radio frequency coaxial surge protector product is commonly used for radio and antenna installations where part or all system equipment is outdoors to protect sensitive equipment and is designed to pass 100 MHz to 512 MHz while suppressing DC surge.