The Diamond SP series of coax surge protectors offer wide-band capability with extremely low loss. They boast an insertion loss of less than 0.3 dB. They have an impulse wave discharge capacity of 6000 Amps. Insulating resistance DC 100 V is over 10,000M ohms. Both feature a replaceable surge arrester element. To protect your precious radio equipment, you need quality lightning protection. Then, when the thunder-boomers approach, you can sit back, relax, and let these Diamond Antenna SP-Series Lightning Arresters take the hit for you!