You could probably do AX.25 over barbed wire.
replyYou can run Ethernet over coat hangers, barbed wire should be fine (if slow).
replyIt has already been done... albeit on short distances. See https://news.ycombinator.com/item?id=15910263 (2017 IIRC). This said I wouldn't expect it to work miles away as an analog phone would.
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