The WRCT5-858.2-858.9-859.1-859.8-40-1 from Wainwright Instruments is a Band Stop Filter with Stopband Frequency 858.9 to 859.1 MHz, Bandwidth 0.2 MHz, Insertion Loss 0.5 to 2.25 dB, Rejection 40 dB, VSWR 1.43:1. Tags: Module with Connectors, Cavity Filter. More details for WRCT5-858.2-858.9-859.1-859.8-40-1 can be seen below.