The WHKE4-20-25-50-400-1 from Wainwright Instruments is a RF High Pass Filter with Frequency 20 / 25 MHz to 400 MHz, Insertion Loss 1 to 2.3 dB, Power 1 W, Rejection 50 dB, VSWR 1.50:1. Tags: Module with Connectors, Lumped Component Filter. More details for WHKE4-20-25-50-400-1 can be seen below.