Ubiquiti 3GHz airFiber Mbps+ Radio. The modular airFiber X radio is a system that will serve a wide range of frequencies and is designed to be compatible. The Ubiquiti airFiber AF-3X Single Unit is a 3 GHz Backhaul Radio. The 3 GHz frequency band offers interference-free operation, enabling the AF-3X to provide. Ubiquiti AF-3X US (half-link) is an airFiber X Backhaul Radio for point-to-point up to + km. It operates between - MHz, with a throughput of GPS Antenna: External, Magnetic Base.