Private free-space communication.

[Karl]

I found https://en.m.wikipedia.org/wiki/Mesh_networking which has some
existing mesh projects mentioned.  I know there are many more somewhere.

The wiki page mentions for example http://broadband-hamnet.org :
"Broadband-Hamnet™
(formerly called HSMM-Mesh™)  is a high speed, self discovering, self
configuring, fault tolerant, wireless computer network that can run for
days from a fully charged car battery, or indefinitely with the addition of
a modest solar array or other supplemental power source. The focus is on
emergency communications."

I recall these different mesh groups used to (probably still do) have
regular get-togethers where the network traffic capabilities of the various
systems were pitted against each other in a competition.
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