The BBP-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 dB, Upper Rejection 20 to 45 dB, Lower Rejection 20 to 50 dB. Tags: Module with Connectors, Lumped Component Filter. More details for BBP-20R5+ can be seen below.