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This is very useful for vhf and uhf radio communications as well, which are normally* line of sight.
In fact, the adsb-receiver[1] software package for setting up an aircraft tracking station includes a neat feature where you can use HeyWhatsThat to calculate maximum line of sight distances to aircraft at various altitudes and include these contours on your aircraft tracking map.
* atmospheric phenomena such as density or humidity differences or reflections from other aircraft, the moon, or even meteors can enable reception over the horizon.
[1] https://github.com/jprochazka/adsb-receiver/releases
It’s also baked into tar1090[1] which is a little more maintained of a package and pretty easy to get set up if you’ve got an SDR and 1090MHz antenna to track planes.
It’s a fun little hobby - where I live there really isn’t much of a reason to do it as there are enough other 1090MHz receivers in the area, but it still is cool when I look and see obscure jets flying overhead.
[1] https://github.com/wiedehopf/tar1090