The WRCT5-865.7-866.4-866.6-867.3-40-1 from Wainwright Instruments is a Band Stop Filter with Stopband Frequency 866.4 to 866.6 MHz, Bandwidth 0.2 MHz, Insertion Loss 0.5 to 2.25 dB, Rejection 40 dB, VSWR 1.43:1. Tags: Module with Connectors, Cavity Filter. More details for WRCT5-865.7-866.4-866.6-867.3-40-1 can be seen below.