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Experimenting with antennas is one of the great joys of ham radio.
In this video from Kevin Loughin (KB9RLW), we go back in time to one of the "classic" HF antennas from the 1920s and 1930's. Kevin's end fed half wave with built-in counterpoise is based on an original 1909 design by German engineer Hans Beggerow, who later used the antenna on Zeppelin Air Ships.
Along with other comments, Steve Ellington fills us in on Beggerow's original concept: