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-small sedan

-trimag mount

-tram bigcat antenna

-lmr400 straight down through roof to radio

-best swr i could get out of 3 antennas was 2.0

-2 inches of snow/ice on roof and swr is now flat.

This goes against what i am researching,  as snow, ice, salt, etc usually raise swr. several of us are stumped as to exactly why, or what i need to do to achieve that 1.0swr without snow and ice. the hole is drilled, the mount will be staying, no leaks whatsoever. if reflectivity is a problem, would rubber undercoating paint on the roof help? there is no regard for the looks of the vehicle compared to the desired low swr. many thanks for ANY responses