The OHP 275-5 from Beijing Ocean Microwave Corporation is a RF High Pass Filter with Frequency 275 MHz to 3 GHz, Insertion Loss 0.29 to 0.31 dB, Rejection 40 @ 143 MHz to 60 @ DC to 107 MHz, VSWR 1.23:1, 1.50:1, Return Loss 14 to 20 dB. Tags: Module with Connectors, Chebyshev. More details for OHP 275-5 can be seen below.