VOACAP Quick Guide: HF Propagation Prediction and Ionospheric Communications Analysis
Propagation | PA2OLD
Ionospheric Working Group, Space Environment Laboratory, Applied Electromagnetic Research Institute, NICT
VHF/UHF Propagation - Radio Society of Great Britain - Main Site : Radio Society of Great Britain – Main Site
DX ToolBox propagation software
CQ Amateur Radio Magazine - Learn about space weather and radio propagation! Your radio propagation and space weather columnist, Tomas Hood ( NW7US ), invites you to check out the educational self-study
Propagation Prediction Websites - Nashua Area Radio Society