?Specification?Package Include: 1x 3.5 inch antenna. 1 x NMO antenna magnetic base with 16.4 ft RG58 coaxial cable. 1 x NMO antenna mount cap. Impedance: 50 ohm. Antenna base pull strength 30.8 lbs. Base diameter: 90mm/ 3.54". ?NMO Antenna Base Cap?Radio antenna base nut effectively protects the unused NMO antenna in all environments. The design of O ring seal in the base to keep water out. It’s the best way to keep your NMO mount dry when washing your car. ?RG58 Coaxial Cable?16.4 ft coaxial extension cable with PL-259 plug for SO239 ham radio antenna. Designed with copper and wrapped in high quality PE jacket, which could maximum protect the signal over large distance. Ultra low-loss in signal transmission. ?Magnetic Antenna Base? NMO antenna mount suitable for all kind NMO antenna and mobile radio with UHF female (SO239) connector. Excellent magnet strength. Powerful suction keep the antenna stay stably. ?NMO Antenna? 3.5 inch UHF VHF dual band ham radio antenna. Frequency range. VHF:136-174MHZ; UHF:400-470MHZ; Gain:2.5dBi. Radio antenna works great for Mobile Radio, Two Way Radio, Marine VHF Radio, Handheld Ham Radio, etc.