The OHP 170-3 from Beijing Ocean Microwave Corporation is a RF High Pass Filter with Frequency 170 MHz to 2 GHz, Insertion Loss 0.31 to 0.35 dB, Rejection 40 @ 88.4 MHz to 60 @ DC to 66.3 MHz, VSWR 1.23:1, 1.50:1, Return Loss 14 to 20 dB. Tags: Module with Connectors, Chebyshev. More details for OHP 170-3 can be seen below.