dealswi-ex in-car signal booster (refurbished) for $99…

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Reviews on the parent site (Amazon) imply you have to make sure you have to make sure you install this carefully following the instructions to get good results. I'd also add make sure your cell provider uses the bands it covers (800 and 1900).

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I have one in my truck and it does help improve signal strength.

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@brutherford: How difficult is this to REALLY hook up?

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@hackman2007: Not difficult at all. You do need to follow the directions on how far the antenna needs to be from your phone. Other than that its just hiding the wires and the hardest part is figuring out how to get the external antenna to the roof of your vehicle without making it look tacky.