today i mounted a h/s sidekick on the roof of my truck w/a mag mount (T_-bar). the manual says to not do it this way. i tuned it to 20m and talked to Bahamas, S. Dakota, Michigan, and other states always w/ s9 and better. the magnets are bare and the paint on the roof is bad. this may be the reason. the mags are directly grounding to the sheet metal. i have no grnd straps..