The AE255-305DB5253 from Anatech Electronics is a RF Duplexer with Frequency 240 to 270 MHz / 290 to 320 MHz, Band 1 240 to 270 MHz, Band 2 290 to 320 MHz, Insertion Loss 3.5 dB, Isolation 40 dB. Tags: Module with Connectors. More details for AE255-305DB5253 can be seen below.