This Tram(R) NMO to UHF Adapter converts a standard NMO antenna mount to a UHF Female (SO-239). This adapter allows any NMO mount to accept a Male UHF (PL-259) type antenna. Consists of a screw-on NMO base with a female UHF connector on top. PL-259 type antennas simply screw on top. Can also be used to quickly connect a PL-259 cable to an NMO mount for stationary operation from your mobile rig!