HF Radio Propagation Chart
HF radio propagation charts are graphical representations of communications established between radio stations within a specified area. See for example:
MUF 3000 km Propagation Map, by Andrew, KC2G
1. How to use this propagation chart? 2. Additional notes 3. Animated map
Read more about HF Radio Propagation Chart. See also an index of terms for HF Radio Propagarion.
The project "Understanding HF Propagation" provides a detailed overview and tutorials on HF propagation.