The SBP-20R5+ from Mini Circuits is a Band Pass Filter with Frequency 20 to 21 MHz, Center Frequency 20.5 MHz, Insertion Loss 2.2 to 3.0 dB, Upper Rejection 20 to 45 dB @ 27 to 380 MHz, Lower Rejection 20 to 48 dB @DC to 17 MHz. Tags: Module with Connectors, Lumped Component Filter. More details for SBP-20R5+ can be seen below.