OUTSTANDING !!!! with the 28db gain on the antenna -lrb- 3db = double the signal -rrb- ; I be travel on the interstate @ the lowest part of a tunnel -lrb- where I usually lose the gp signal -rrb- , with this antenna ... still strong signal , pick up both side of the tunnel which be separate by thick cement wall , the water & surrounding land mass . however ... the description do NOT tell you that the cable be only 9 ' long . order the extension cable ; NOT COMPATIBLE . have to call Gilsson directly to order the same radome -lrb- antenna -rrb- with a 25 ' cable on it . $ 39.95 + S&H; , go with the windshield mount $ 4.95 -lrb- with suction cup -rrb- , level it & work great . in the ramparage -lrb- usually lose signal 5 ' into it ... be able to track myself even @ the innermost part of the structure . just do a little more research before you buy .