The RMFI.178Nfm from Response Microwave Inc is a Low Pass RF Filter with Frequency 137 to 178 MHz, Stopband Frequency 270 to 870 MHz, Insertion Loss 0.6 dB, Rejection 60 dB, Power 50 W. Tags: Module with Connector, Chebyshev Filter. More details for RMFI.178Nfm can be seen below.