As always, Amazon is amazing in making returns and high customer satisfaction. My problem is not with them, but this device. It simply DOES NOT WORK. I contacted weBoost expert technical support and verified that everything was installed and operating properly. I have my phone set to show db numbers, not bars, and there was virtually NO CHANGE in the signal. Not even 1 single db boost. I bought the additional 12" antenna and tried both the supplied and additional antennas, but it made no difference whatsoever. I have a Dodge Mega Cab truck with a metal-roof ground plane the size of most entire vehicles, so that was definitely not the problem either.