↑ What is HF Wave Propagation?

Edited by Doron Tal, 4X4XM

HF Wave Propagation describes the behavior of radio signals at high frequencies (HF), typically in the range of 3-30 MHz. These waves can travel hundreds of kilometers, allowing for long-distance communication. The free electron density of the ionosphere influences the reflection of these radio waves. During the day, the ionosphere becomes more ionized, with higher frequencies reflected back to Earth. At night, it becomes less ionized, with lower frequencies reflected back to Earth.

You may find more detailed information in the main webpage, here. See also an index for HF Radio Propagarion.