ELECTRICAL SPECIFICATIONS Frequency Range: 144/430MHz Band Width: around 20MHz Impedance: 50 Ohm VSWR: Less than1.5 Gain: 3/6.5 dBi Polarization: Vertical Max. Power Input: 100W Lighting Protection: Direct Ground MECHANICAL SPECIFICATIONS: Dimensions: Diameter 4.5 Length:1100 mm Diameter of Hardware-supplied: Dia.31mm Radiating Element Material: Cu Radome Material: Fiberglass Connector: SL16 Female/SO-239