The WHKE3-20-25-40-500-1 from Wainwright Instruments is a RF High Pass Filter with Frequency 20 / 25 MHz to 500 MHz, Insertion Loss 0.8 to 1.3 dB, Power 1 W, Rejection 40 dB, VSWR 1.50:1. Tags: Module with Connectors, Lumped Component Filter. More details for WHKE3-20-25-40-500-1 can be seen below.