As far as I am aware, a radio signal is basically just shouting into the void, and anyone who is tuned to the correct channel can hear you clear as day, like a car radio. So, how do militaries keep their radio signals from being over heard by the enemy? Do they have special radios, or are the communications sent over radios just not that important strategically?
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The radios are special but the methods are common to consumer electronics, but just more robust.
Encryption is just part of the process. On top of that, communications data is [chopped up and sent through different frequencies at once.](https://en.wikipedia.org/wiki/Frequency-hopping_spread_spectrum)
Only if the receiver knows which frequencies at which times are transmitting the right information can it even begin to decrypt.
And that’s just the handheld stuff.
Sometimes its also just a matter of having a literal set of wires, carefully guarded, that only goes from point A to point B. Nobody but A and B will know.
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