The radio in the 1930's was a common item found in nearly every household in America. So everyone knows how sound works, there are different vibrations with different wave lengths, in our voices, it's our vocal cords that make the vibrations, in radios electricity flows through an antenna making electrons move up and down. These waves then travel the speed of light to another antenna, then these electron vibrations are projected through the speaker. But wouldn't you hear all the waves? Well that is where the dials and knobs that tune you into a certain station. Different types of antennas make different types of waves, but most common are antennas that don't travel super far, and in that range, every station has their own frequency. That's why when you take a road-trip you might have to change the station as you go in and out of different station's ranges.
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