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My two cents: A possibility might be LoRaWAN on the 2.4GHz spectrum, for which there are also satellites in orbit. The LoRaWAN ("Long Range Wide-Area-Network") protocol is based on a chirp-spread-spectrum (CSS) modulation and has a very high range. I've used LoRaWAN before but not on 2.4GHz or with a satelitte, so I can't comment on the practical ...

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