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Speedtest.net bought a service that was doing this already sort of. I looked just now and I think it’s their “map” option on their mobile app. You need to switch between carriers to see coverage.
The tech was based off of manual speed tests and a background app that would measure coverage from a phone for a small area, about the size of 3 square acres.
If you live in a dry climate you can create a makeshift evaporation cooler with a fan, tub, water pump, and evap material.
Set it up in front of an opened window, blow it into the house, and open a window at the other side of the house. You can easily get 20 degree F drop in temp.