You have a choice of fiber, microwave, HF, UHF, VHF, carrier pigeons, etc.
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Repeaters.
Repeaters
That's a real variable. By that, I mean that it depends on the RF output power of the repeaters in watts, the receiving system's sensitivity, AM/FM, whether or not you're using directional antennas, terrain conditions, weather conditions, etc. Without more info, that's the best I can do.
One
a link between two or more things; a plane or line