The wilson 1000 antenna magnet mount (radio and amp are both chassis gounded) is an awesome antenna, i havent touched a cb since 98 and i liked k40s my cobra 148f gtl is faithful and just such a fine radio anyways that antenna the swr is flat 1 thru 4o and barely wiggled at 27605 which is higher than i go anyways, down low maybe got to a 1:2 wow thats good