... careful debugging with follow qualities: Good standing wave performance,high gain,broad band,big F/B ratio,strong structure, Own ... the good ability of antihunting,waterproof and anticorrosion; Small size,easy installation,the directional ... installate on iron tower or roofFunction introduction: 1.Frequency range 870-960MHZ 2.Gain ( dB) 11DB / 15DB3.I/O impedance 50Ω/ ...