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Jan 24, 2019 at 5:43 comment added Mark AT&T Long Lines used microwave relay towers to span the entire United States. Those are strictly line-of-sight.
Jan 24, 2019 at 1:28 comment added AlexP "Without the possibility for radiowaves to bounce against [the ionosphere], it wouldn't be possible to broadcast to a receiver behind the horizon": (1) longwave broadacasts; (2) repeaters. Only shortwave radio broadcasts rely on the skywave being reflected by the ionosphere. Longwave broadcasts rely on the groundwave following the curvature of the Earth and going around mountains; and ultrashortwave broadcasts are not reflected by the ionosphere and need repeaters to cover a nation's territory.
Jan 23, 2019 at 20:56 history answered McTroopers CC BY-SA 4.0