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Given the angle that cell signals come in (direct line from the tower, NOT bounced from the stratosphere), I would think that your wall construction would matter a lot more than your roof.
I don't have a metal roof yet (will let you know in a few months whether it changes things), but I do have brick exterior and (real) plaster interior wall. Does not seem to attenuate the signal much if at all.
I do find that cell phones go dead in large retail establishments, especially supermarkets but also building supply stores though less so. But I have to go quite a way inside before it goes dead -- farther inside than the size of a house.
So I'd say that in a large commercial building, metal construction will be a big problem for cell phones. OTOH, in those situations, the cost of a repeater would be a very small part of the total construction cost.
Edward
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I have seen devices on the internet that plug into your home and I think you run a cord or something maybe in your attic(cuz that is probably where you would get the strongest signal).
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I also have a metal roof and any cell phone (at@t,verizon,sprint/nextel) will not work at all unless you are right up against the window. Going in the attic makes it worse. Bought a ZBoost cellphone signal booster from RadioShack.com. My cellphone works but halfass. You can recieve or dial but dropped call are very common. Wasnt worth the 400 bucks. The Zboost comes with an attenna for outside. It tells you, in the instructions, to not place the exterior attenna anywhere close to metal or a metal roof. Hope this helped anyone looking into this subject.
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metal roofs do prevent signal from penetrating the roof, the only solution in my mind is a cell phone signal booster, http://www.cellphoneboosterstore.com
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We have A T & T and they offer a Micro Cell which is basically a cell phone signal booster for inside the house that you plug into your wireless router. Works great.
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