The C-115 from Crane Aerospace & Electronics is a Bi-Directional Coupler with Frequency 5 to 500 MHz, Frequency Sensitivity ±0.5 to 0.7 dB, Coupling 20 dB, Coupling Variation ±1 dB, Power 1 W. Tags: Flatpack, Multi-Octave. More details for C-115 can be seen below.