I installed this passive antenna repeater through the heavily tinted area of my windshield, and my signal strength went from no bars to 3 bars immediately. The added signal strength was verified using my Bluetooth stereo connected to my cell phone and my phone call went uninterrupted without being dropped, in a normally call dropped area. The reception on the phone call was very clear without signal distortion and was asked to verify my location by the recipient of my phone call because of the clarity they thought I was in a different area than I usually am in when I call them. I would recommend this passive antenna repeater to anybody who has signal strength problems with their cell phone in their automobile.