I had to mount mine to the rear of my Cherokee. SWR is barely over 1 on channel 1,19,and 40.Btw , Mine is on an Eddie Bauer Explorer , had to mount it way back near the hatch because of the ribs in the roof won't let the magnet seat right . But it works fine there , just wish I could have got it more toward the center . My mobile setup , Old Cobra 140gtl/Turner+2 hand mic or Astatic D6 / King Bee 250w/ Stryker Sra-10a antenna .