The WHK8-600-700-40-4000-20 from Wainwright Instruments is a RF High Pass Filter with Frequency 600 / 700 MHz to 4 GHz, Insertion Loss 0.85 to 1.2 dB, Power 20 W, Rejection 40 dB, VSWR 1.50:1. Tags: Module with Connectors, Lumped Component Filter. More details for WHK8-600-700-40-4000-20 can be seen below.