The AE12H9791 from Anatech Electronics is a RF High Pass Filter with Frequency 12 to 40 MHz, Insertion Loss 0.5 dB, Rejection 49 dBMin.@ 4.06 MHz, Return Loss 15 dB, Operating_Temperature -25 to 70 Degree C. Tags: Module with Connectors, Lumped Component Filter. More details for AE12H9791 can be seen below.