Low Frequency Radio Range
In the late 1920s, the Adcock antenna was adopted for aerial navigation, in what became known as the Low Frequency radio range (LFR), or the "Adcock radio range". Hundreds of transmitting stations, each consisting of four or five Adcock antenna towers, were constructed around the U.S. and elsewhere. The result was a network of electronic airways, which allowed pilots to navigate at night and in poor visibility, under virtually all weather conditions. The LFR remained as the main aerial navigation system in the U.S. and other countries until the 1950s, when it was replaced by VHF-based VOR technology. By the 1980s all LFR stations were decommissioned.
Read more about this topic: Adcock Antenna
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