●Stainless steel radiating element,strong impact resistance,corrosion resistant,waterproof,good environmental adaptability ●Heavy duty magnetic base,powerful enough to stay on the vehicle roof at any speed,covered by a rubber pad,no roof damage; detachable design,easy to operate and install(Requires Metal Ground Plane) ●High gain benefit,improve reception and transmission of your radio; Extend the range of your communication. ●For indoor and outdoor use,fit Vehicle, Car, Truck, SUV, RV, etc. ●[ELECTRICAL SPECIFICATIONS]Frequency range: 144/430MHz(VHF 136-174MHZ,UHF 400-470MHZ); Impedance: 50Ω; VSWR:<1.5; Gain: 2.15dBi(144MHz),3.5dBi(430MHz); Maximum Power Input-watts: 50W ●[MECHANICAL SPECIFICATIONS]Height: 490±5 mm; Termination: PL259(SL16-male); Weight: 650g; Diameter of Mag Base: Ø90mm(3.5inch); Suction:14KG(About 30.8lb); Cable length/Type: 4m/RG-58