QO-100 Coverage - Under Construction !!

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https://en.wikipedia.org/wiki/Horizon
“The horizon is the apparent line that separates earth from sky, the line that divides all viewing directions based on whether it intersects the Earth’s surface or not. The true horizon is actually a theoretical line, which can only be observed when it lies on the sea surface”

https://en.wikipedia.org/wiki/Tropospheric_propagation
“Tropospheric propagation describes electromagnetic propagation in relation to the troposphere. The service area from a VHF or UHF radio transmitter extends to just beyond the optical horizon, at which point signals start to rapidly reduce in strength”