"JulianMartin" is my new hero! Sorry, Tesla.
No worries, old chap.
This is, indeed, a very nice piece of Round Earth evidence which FET is, at present, unable to refute.
But then, so was the sun-rise and sun-set bearings on The Equinox evidence, but Flat Earthers just said that "light bends horizontally" and left it at that.
And so was the Antarctic Midnight Sun evidence, but Flat Earthers just said that an image of The Sun "bounced around crystals in The Ice Wall" and left it at that.
And so was the Southern Celestial Pole always due south evidence, but Flat Earthers just ignored that one because "astronomy is only an observational science".
Tom is doing the same here with the "radio waves bounce off hill-sides".
For him that is an adequate refutation of the evidence.