Does anyone here know of a publicly available (not necessarily free) source for cellular coverage in the contiguous 48 states? In a meeting the other day, we found a great map source that displayed a heat-map (colors showed signal strength) of coverage across the country, along with which carrier had the best signal by type, but it was road-based. I'm looking for the "blobs" or lozenge shapes over the countryside, because, well, to quote Emmett Brown, where we're going, we don't need roads...
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