The WHKE4-25-50-60-500-1 from Wainwright Instruments is a RF High Pass Filter with Frequency 25 / 50 MHz to 500 MHz, Insertion Loss 0.9 to 1.5 dB, Power 1 W, Rejection 60 dB, VSWR 1.50:1. Tags: Module with Connectors, Lumped Component Filter. More details for WHKE4-25-50-60-500-1 can be seen below.