Up for sale is a DX Engineering RTR-1 Receive Antenna Interface for transceivers. Allows seamless integration of a dedicated receive antenna with your main transmitting system while providing full protection against accidental RF damage. Multiple antenna ports: RX ANT IN, MAIN ANT IN/OUT, RADIO, and TX GND. 12V DC power input. RoHS compliant, made in USA. This has been gently used, comes with power supply and manual.