Short of a satellite system, there isn't much you can do. The carrier frequencies that carry the digital data nowadays (mostly uhf freqs but some vhf) are line of sight only. And while the old analog transmissions would give you a fuzzy, blurred picture and decent sound at the fringe of the signal footprint, with digital, you either have a useable signal or you don't.
Raising the antenna would help as it expands the distance to the horizon but how are you going to do that?
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