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Studying the MF/HF radio stations. Their role in GMDSS, main requirements to installation and survey. GMDSS Radio Survey Blog
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navigation - What was the range of a low-frequency radio range station? - Aviation Stack Exchange
Radio Spectrum
Low-frequency radio range - Wikipedia
LF Radio on the App Store
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EI7GL....A diary of amateur radio activity: ZOOM presentation about the SAQ LF transmitter in Sweden coming up on Tues 20th Oct 2020
Telecommunications media - Radio transmission | Britannica
