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</html><thumbnail_url>https://ka6ete.net/hamradio/wp-content/uploads/2023/05/Vedda-Koller_Radio-Frequency_F-thumbnail-768x432-1.jpeg</thumbnail_url><thumbnail_width>768</thumbnail_width><thumbnail_height>432</thumbnail_height><description>High-frequency (HF) propagation is a critical component of long-distance communication, particularly for amateur radio operators and those involved in emergency communications. Understanding HF propagation is essential for anyone who wants to communicate over long distances using radio waves. Radio waves &hellip; Continued</description></oembed>
