For where to shield from (direction); where are your local cell towers, mapped:
https://www.cellmapper.net/map
https://www.cellmapper.net/map
Now we know, where shielding applied inside the home might be most effective. ;)
... And which frequency ranges are MEANT to be the ones, in use, around us.
Forwarded from FB
Spectrumanalysator bb60c from Signalhound is the cheapest device to find a state level actor.