A:Answer You have to be careful when mounting this unit. It must have an unrestricted view. Windshield wipers and a tinted brow on the windshield will affect the range on this detector. Mounting it above the windshield wipers and ensuring that the detector is fairly level will assist in how well it can detect radar/laser. This detector has signaled for a radar over 1 mile away when it had an unobstructed view. Remember that buildings, hills, and other things can interfere somewhat with the detector's ability.