The BPF-B59 from Mini Circuits is a Band Pass Filter with Frequency 57 to 61 MHz, Bandwidth 4 MHz, Center Frequency 59 MHz, Insertion Loss 3.9 to 5.5 dB, Rejection 20 dB @ DC-52 MHz and 68-2600 MHz. Tags: Surface Mount, Ceramic, Ceramic Filter. More details for BPF-B59 can be seen below.