Its not the length of the antenna, its where its mounted. ...... in indian trail, and when they put it on my rig, it read perfect at all 40 channels..... If you want peak performance, mount it on the roof, or as high up as you can..The trick is to have as much of the antenna as possible over the roof. Like if you put the firestick on the roof with a good magnet mount, it would get better reception that a whip on the rear bumper. If you have a stock radio, you are probably running like 10 watts.... I have a little cobra 25 WTX, and I am making 35 watts peaking 40, which is pretty good for a 40 dollar unit. I can get about 30 miles reception 360 degrees. Hope this helps man.