High frequency - Wikipedia
HF radio becomes low-cost alternative to satellite | High-frequency radio - Urgent Communications article
RAC 0 – 30 MHz Band Plan – Radio Amateurs of Canada
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High Frequency (HF) Radio
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New Technician HF Privileges Defined: ARRL board accepts final recommendations of the Band Planning Committee | The SWLing Post
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Aircraft Vhf Radio Frequencies | Radio, Radio channels, Radio frequency
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The HF Bands - For HF Newcomers - Resource Detail - The DXZone.com
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MF and HF Amateur Radio Band Charts - Resource Detail - The DXZone.com
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