[LandCruisers4Life]

I have a 3ft long top loaded K40 antenna on a 5" magnetic base. It works fine for a few miles coverage.

My CB is a Cobra, and has a built in SWR calibration unit. I usually don't even have to touch the antenna, just tune the swr vs what my antenna is at on the radio. Works perfectly. Tune on channels 1, 20, and 40, with 20 being most important.