The VHF50B43-ME-PGR-BU from PolyPhaser is a RF Surge Protector with Frequency 100 to 520 MHz, Input Power 750 W, Insertion Loss 0.1 dB, Operating Temperature -50 to 85 Degree C, Return Loss 26 dB. Tags: Filter. More details for VHF50B43-ME-PGR-BU can be seen below.