The CTM-20M-8G from Crane Aerospace & Electronics is a Directional Coupler with Frequency 4000 to 12400 MHz, Coupling 20 dB, Coupling Variation ±1 dB, Frequency Sensitivity ±0.40 dB, Directivity 17 dB. Tags: Module with Connectors. More details for CTM-20M-8G can be seen below.