navigation - What was the range of a low-frequency radio range station? - Aviation Stack Exchange
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Radio Aids to Aircraft Navigation: Low-Frequency Ranges & Direction Finding, July 1960 Electronics World - RF Cafe
Low-frequency radio range - Wikipedia
Very low frequency - Wikipedia
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A Proposal for the Establishment of a Low-Power, Frequency Modulated, Educational Radio Station as Exemplified by Oklahoma Baptist University - UNT Digital Library
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Jim Creek Naval Radio Station - Wikipedia
Jim Creek Naval Radio Station is a United States Navy very low frequency (VLF) radio transmitter facility at Jim Creek near Oso, Washington. Established in 1953, the transmitter radiates on 24.8 kHz
Ramsey FM100B FM Transmitter
British DX Club - Radio Stations in the UK & Ireland
Low Frequency Radio Group
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Electromagnetic Spectrum - Introduction
Types of Frequencies and Wavelengths in the Radio Frequency Spectrum
The Ionosphere
