The WRCT8-865.9-866.4-866.6-867.1-50-2 from Wainwright Instruments is a Band Stop Filter with Stopband Frequency 866.4 to 866.6 MHz, Bandwidth 0.2 MHz, Insertion Loss 0.6 to 3.5 dB, Rejection 50 dB, VSWR 1.43:1. Tags: Module with Connectors, Cavity Filter. More details for WRCT8-865.9-866.4-866.6-867.1-50-2 can be seen below.