The WHK4-260-600-40-3000-20 from Wainwright Instruments is a RF High Pass Filter with Frequency 260 / 600 MHz to 3 GHz, Insertion Loss 0.4 to 0.5 dB, Power 20 W, Rejection 40 dB, VSWR 1.50:1. Tags: Module with Connectors, Lumped Component Filter. More details for WHK4-260-600-40-3000-20 can be seen below.