The BRF-155MS1 from RF ONE Electronics is a Band Stop Filter with Stopband Frequency 0.135 to 0.175 GHz, Insertion Loss 3 dB, Rejection 40 dB, Power 50 W, Return Loss 8 dB. Tags: Module with Connectors, Cavity Filter, Ceramic Filter, LC Filter. More details for BRF-155MS1 can be seen below.