- Amateur Radio Propagation Studies
 - Offers a scientific studies on the upper atmosphere, a propagation observatory, and links to space weather and propagation resources. - BeamFinder.net
- Learn about BeamFinder, a software tool designed to conduct analyses for radio amateurs interested in radio propagation studies.
- DF5AI
- Amateur radio propagation studies.
- Propagation Resource Center - NW7US - HFRadio.org
- A HF and VHF radiowave propagation centre that offers live propagation and space weather data and forecasts
- Propagation Service Center
- Dedicated to long and short term predictions on radio propagation, solar, and terrestrial activity.
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