The RMCO20.5700-5900Sfa from Response Microwave Inc is a Directional Coupler with Frequency 5700 to 5900 MHz, Coupling 20 dB, Directivity 20 dB, Insertion Loss 0.5 dB. Tags: Module with Connectors. More details for RMCO20.5700-5900Sfa can be seen below.