The WRCT8-858.4-858.9-859.1-859.6-50-1 from Wainwright Instruments is a Band Stop Filter with Stopband Frequency 858.9 to 859.1 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 WRCT8-858.4-858.9-859.1-859.6-50-1 can be seen below.