There are also digital modes that use radio scatter and reflections (meteorites, airplanes,....) to communicate "further" than line-of-sight allows. It's a qui

There are also digital modes that use radio scatter and reflections (meteorites, airplanes,....) to communicate "further" than line-of-sight allows. It's a quite well know "ham radio thing", although it's mostly "empty", and few hams actually use those modes.