Assuming you know what "
Evanescent-Waves" are, FTR I haven't got a clue.
Quote:
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In Colorado Springs, where he stayed from May 1899 until 1900, Tesla made what he regarded as his most important discovery-- terrestrial stationary waves. By this discovery he proved that the Earth could be used as a conductor and would be as responsive as a tuning fork to electrical vibrations of a certain frequency. He also lighted 200 lamps without wires from a distance of 25 miles( 40 kilometers) and created man-made lightning.
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http://www.teslasociety.com/biography.htm
ETA: The same claim appears here:
https://www.britannica.com/biography/Nikola-Tesla