The QSSTFTMBK00 from NexTek, LLC. is a RF Surge Protector with Frequency 435 to 470 MHz, Input Power 500 W, Insertion Loss 0.05 to 0.1 dB, Return Loss 23.1 to 32.3 dB, Surge Current 25 to 40 kA. Tags: Quarter-Wave Shorting Stub (QWS). More details for QSSTFTMBK00 can be seen below.