I returned this product soon after purchasing it. I have a, roughly, 1 mile dead zone on my drive from my house (rural) into the city. This dead zone is created from mostly foliage growing in the summer, and the two cell towers in this area just having a hair of non-overlap. Since I have prime and amazon prime has excellent return policies, I gave this a shot. But a week of trying and driving through the dead spot on purpose and nothing improved. No extra bars in the dead spot, and no improvement on the bars and reception in the areas where I do have service already. This was literally just a piece of plastic on my car. I have seen other reviewers saying that they have had success with these in stationary areas, so this might be worth a try if that is the main problem, but for me I get reception fine at my house.. on my car, moving, not so much. I gave 2 stars because other reviewers were saying it works in other applications, but a car repeater as described in the title? This is not.