Anyone who is familiar with the hobby of short wave listening knows that spy tools don’t have to come in the form of pocket gadgets. Numbers stations are technically usually from an unknown origin, but a large number of people assume that they are used as spy tools. For those who aren’t familiar, short wave radio refers to broadcasts and services that take place from approximately the end of the medium wave AM broadcast band to the beginning of the VHF region of the electromagnetic spectrum. Signals at these frequencies can travel all over the world, which makes them perfect spy tools, though there are countless legitimate users of the spectrum.
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