Here’s your video introduction to Section 10.1, HF Propagation, in the ARRL Extra Class License Manual for Ham Radio. Topics include ground wave propagation, NVIS, sky wave propagation, Pederson ray, absorption, long-path and grayline propagation, and fading.
You can return to the complete list of Amateur Extra Class training videos by clicking here. If the DX Atlas software interests you, you can learn more by clicking here to go to the Afreet Software site.