Comment: Bump because-

(See in situ)

Bump because-

Well, cell phone towers may actually be being used as
look-through-walls capable real time imaging surveillance
devices and no one - except maybe the people doing it
and the Taliban - seem to be aware that this even a possibility.

It was pointed out to me that at the frequency that most
cell phone systems operate at, the wavelength is so long
(about one meter) that a return from it would be pretty useless
for imaging. But 4G systems are close to 3Ghz and that brings
it down to around 1/10 of a meter - say, 4 inches..

Maybe close enough for government work.