navigation - What was the range of a low-frequency radio range station? - Aviation Stack Exchange
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Low Versus High Radio Spectrum - High Tech Forum
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Low Frequency Radio Astronomy and the LOFAR Observatory: Lectures from the Third LOFAR Data Processing School (Astrophysics and Space Science Library, 426): Heald, George, McKean, John, Pizzo, Roberto: 9783030132415: Amazon.com: Books
navigation - What was the range of a low-frequency radio range station? - Aviation Stack Exchange