This is a wideband mobile whip that is manually tuned by sliding the telescoping coil at the base. The top whip may also be adjusted for fine tuning and optimizing the VHF/UHF performance. Maximum length of the antenna is 1.77m and maximum power handling is 130W Specifications: Type: 1/4wave reduced type (HF band) 1/4wave (50/144MHz band) 5/8wave (144/430MHz band) Frequency: 7-440MHz Max.power rating:130W (SSB) Connector: PL259 Impedance: 50Ω Length:0.5m – 1.77m / Weight:300g