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Short wave radio EVOLVED. The lower wavelengths below 300Meters- were assigned to amateurs, as the commercial stations thought they were worthless... around the teens or after World War I.=( the 200Meter wavelength was used by Tramp steamers, though) Amateur experimentation indeed opened up horizons in this field from when radio amateurs first came out legally ( around l9ll in the US) onwards, so the discoveries were made more or less accidentally poking around with the assigned lower frequencies and improving on coils, tubes, antennae, etc.
The radio station KDKA became the first radio station. It launched in 1920 and was founded by Henry P. Davis.
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