h a l f b a k e r y
You could have thought of that.
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because too much paranoia isn't nearly enough.
I did a search for this and didn't see any references to it, so if it exists already a.) I haven't seen it and b.) I didn't know it existed. Apologies if it's not new. I'm sure you'll let me know if it's a bad idea. ;)
This is an electromagnetic (EM) or radio frequency (RF) map of residential areas.
The EM spectrum would be divided up into frequency bands, each one assigned a color. Trucks containing EM-RF field strength detecting equipment would roam around residential areas taking measurements at pre-determined locations. Data would be compiled into maps, each one a certain frequency band with at least "X" field strength. Many maps would be needed to cover the higher-freq end of the spectrum, but taken together you would have a good idea of the amount of RF coming your way. This may or may not help you sleep better at night.
Taken a step further, a picture of the changing RF landscape around your neighborhood could be captured over time.