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propagation - What is the cause of this unusually long period of terrible HF band conditions? - Amateur Radio Stack Exchange
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RossRadio on Twitter: "Ham Radio Tutorial – HF Radio Wave Propagation HF Radio Wave Propagation https://t.co/yASbbq6V2t https://t.co/uNwzQ35VW7" / Twitter
![HF Propagation - Radio Society of Great Britain - Main Site : Radio Society of Great Britain – Main Site HF Propagation - Radio Society of Great Britain - Main Site : Radio Society of Great Britain – Main Site](https://rsgb.org/main/files/2012/11/propagation_hf-propagation-paths.png)