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A 20-meter-long T²FD antenna, covering the 5-30 MHz band. The Tilted Terminated Folded Dipole (T²FD, T2FD, or TTFD) or Balanced Termination, Folded Dipole (BTFD) - also known as W3HH antenna - is a general-purpose shortwave antenna developed in the late 1940s by the United States Navy.
The T2FD was conceived with coax in mind from the start. At best there might have been a balun in a metal box bolted outside the superstructure, ladder on one side, coax on the other. There even are complaints voiced in the ham community in the 40's and 50s for HAVING to use low Z unbalanced on surplus mil gear while the ham tradition was open ...
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