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[–]zyxzevn 2 insightful - 1 fun2 insightful - 0 fun3 insightful - 1 fun -  (0 children)

I don't see the advantage of "air-gapped" communication.
Usually it is via the speaker and microphone. It is slow and meant to be used to hack networks that are disconnected from the main network.

Yet, it is easy to make a wire-less communication system with antennas.
If you use low frequency AM, if you transmit to the other side of the world.
With Software Defined Radio (SDR), you can even use whatever transmission you like.
I think that you can make a decent communication device using SDR and a Raspberry Pi.
Like one that changes frequency bands and digital encoding each few seconds.

I also see a future in an open WIFI communication system that redirects
signals to another antenna. That way you can mimic the cell-phone network an an area.
The Hong-kong protesters used it sometimes.