X510M/N 144/430MHz(2m/70cm) Gain:8.3dB(144MHz),11.7dB(430MHz) / Max. power rating:200W / Impedance:50ohms / VSWR:Less than 1.5:1 Length:5.2m /Radial length:approx.52cm / Weight:2.0kg / Rated wind velocity:40m/sec. Mast diameter accepted:30mm to 62mm / Connector:M/N Type:3 x 5/8wave C-Load(144MHz),8 x 5/8wave C-Load(430MHz),FRP outershell