HF propagation for beginners
When we say "HF Propagation", we mean high frequency radio waves, which typically range from 3 MHz to 30 MHz.
These radio waves are used for long-distance communication over hundreds to thousands of kilometers, via the ionosphere (skywaves).
Read more about HF Propagation. See also an index of terms for HF Radio propagation.
The project "Understanding HF Propagation" provides a detailed overview and tutorials on HF propagation.