The C4-20-VHF-B-50 from I.F. Engineering is a Directional Coupler with Frequency 20 to 200 MHz, Coupling 20 dB, Directivity 25 dB, Average Power 2 W, Insertion Loss 0.65 dB. Tags: Module with Connectors. More details for C4-20-VHF-B-50 can be seen below.