Siemens SPD4coax Incoming Service Entrance Surge Protective Device UL 497C Listed, Includes Overcurrent Protection with a 5 Year Warranty Operational frequency range frequency DC-1.5 GHz Surge current capacity 5,000-Amp Impedance = 75 Ohms Return loss 30 dB at 1GHz, and Insertion loss &lt; 0.1 dB