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Perhaps the door is metal as well and what we've both done is create large passive repeaters. As luck would have it I decided to anchor the antenna with a magnet to the outdoor grill so that it would uncoil as I moved away. I decided to see whether uncoiling the cable would help. I saw another review which describes excellent results after attaching to a storm door. My home is in a virtual dead spot. Initially I was disappointed by the negligible increase in signal strength. The signal strength rose from about a half bar to four.
I had low to zero expectations so I was pleased with the difference. I am going to get two more to see if that makes an even bigger difference. I didn't expect much from this but it definitely increases cell phone strength slightly, one full bar if you are pretty close to the antenna. I am using it in a concrete shop with poor reception and mounting one on the window has helped a bit.
its on my truck, but how it works its still unknown. I still get my phone calls, so I guess it works.
It only works in few feet around that window and has to stand up to make a call. It is still a huge improvement that able to make/receive phone call from part of the room.In conclusion: This product works in a small area that has cell signal blocked. Stick the two piece on each side of window. There is a small window in the basement that is just in the level of ground. Have doubt on it initially thinking a $10 product can solve the big problem. Just bought one for a friend who lives in basement that has no cell signal. But it is only $10, why not give it a try.The product is easy to setup. Few minutes later, got signal.It is not perfect.
This antenna did not make any improvement in the cellular signal when I mounted it on my vehicle.
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