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@HopelessDemigod yep, I have wondered about meteor scatter, which can provide 24/7 coverage in the range 500km-2300km if set up properly and also using burst mode comms. Very low bandwidth, but it doesn't depend on any fixed infrastructure, and is also resistant to nuclear effects. HF skip paths will be blocked by ionized air where detonations happen, but VHF will pass through.
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