Worth a look... lots of graphics and links to all things which relate to how well radio waves travel to and fro.
73, W4HKL
De-mystifying HF Radio Propagation and Modeling :: HFRadio.org
Radio Propagation : Space Weather : Sunspot Cycle Information
(If you like it, don't forget the tip jars at the top of the page! And, no, I don't have anything to do with hfradio.org!))
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