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Originally Posted by swaghauler
Don't forget about Single Side-Band Radio.
While VHF and UHF are both basically limited to "line-of-sight" communications (about 50km to 75km with a VERY tall whip antenna) without prepositioned "Rebounders" (tall towers that amplify and redirect the radio signal to extend the signal range up to around 150km based on their position), SSB is NOT so limited.
For those who are unfamiliar with Single Side Band Radio, it is a radio that operates in the lower Megahertz band and uses the atmosphere to bounce a signal a LONG WAY off. While primarily used by sailing vessels, it can also be found on ground installations. It can be identified by its long (25ft+) whip antenna with an unusual metal "directional" dish at the bottom (a disk angled upwards). Significantly powerful radios (up to 1000 watts output) have transmitted CLEARLY at ranges exceeding 7000km. The signal is bounced off of the Ionosphere and the higher the Sun is, the lower the frequency range you need (3 to 5 MHZ) while a higher frequency (8+ MHZ) is needed in a lower "charged Ionosphere" (the sun is setting or down). Many of these units could have survived, being on board both merchant vessels and sailing cruisers (who even have their own radio nets to use) during The Exchange.
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I think the early Air Force used it.