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?
In: Technology
It depends. There are a couple of methods. One of the larger/more general ones is encryption. There are many different ways it is implemented. There are dedicated radio encryption devices as well as radios with encryption built into them.
Additionally there are other technologies such as frequency hopping that make it difficult to find out exactly what frequency is being used at any given time.
Edit: something else is also not talking about certain things on the radio. Somethings should not be communicated over radio (because it is so much less secure than other things). Or you can use code words. So instead of saying “Switch to frequency 100.1” you would say “Use Banana Boat.”
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