Quoth Evandril
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I can go just outside that area say out the front door or go back to the bedroom OR go upstairs in the same place as the 1st floor and get 5 bars and good reception.


)

They're much stronger than wi-fi, of course, but they're still subject to interference, especially from brick/concrete walls, reflectivity of the area (signals are waves -- they bounce), etc. You could quite literally just be in a small dead zone within a circle of transmitters, where they don't *quite* all meet.
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