Comet CF-416A HF-VHF/UHF Transceiver Duplexer - 1.3-170Mhz & 350-540Mhz Duplexer for use with 2 different band Transceivers on 1 Dual Band Antenna. Can also be used to seperate 1 Transceiver to 2 seperate band antennas. One side input accepts Frequencies between 1.3-170Mhz, The other input accepts 350-540Mhz. Pl-259 connectors on input leads, Combined output is an SO-239 connector. High Power Low loss, Great for Amateur Radio & commercial uses.