The PRO-TRI 174/380-520/760-960 is a Triplex Filter (Multiplexer) used for combining /splitting 3 LMR/PMR radios, a VHF, a UHF, and an LTE to/from just one antenna. It comes in 2 versions both with SMA connectors, one for low/medium power up to 30 W per radio and one for high power radios up to 150 W per channel.