The Imax 2000 is the longest CB antenna, once built it measures 24 ft, so you better make sure it is well supported! It is easy to swr all you have to do is connect in an SWR meter and turn the tuning rings at the bottom. Optimum swr 1.5 - 1 5.1 dbi gain, dc grounded, 24' tall ( three 8' sections ), insulated up to 14,500 volts, can be used for export, commercial, and 10-meter ham. Solarcon 5/8 wave, base station antenna, end-fed 5/8 wavelength radiator, extended I-max (current maximum) center section, radials are not required!, wind rating - 100 mph, solarcon I-max 2000, three 8' sections, tuning rings for adjusting swr, dc grounded, full 5/8 wave, covers far above and below the traditional CB channels, usable from 25.500 MHz to 28.700 MHz without a tuner, handles 5 kw.