RESOURCE:  DOCUMENTS REFERENCED IN THE OCFD eBook

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The Original QST Article describing the research and development of the antenna that later became know as the Windom antenna:

• Notes on Ethereal Adornments, by Loren G. Windom, QST Magazine, September 1929, p. 19-22 + 84.

An excellent article on Windom antennas, describing its development and how it works. 

• Windom antenna, by John H. Nagle, K4KJ, ham radio magazine [hr], May 1978, p. 10-19.

The Original QRV Article describing the FD-4 "Windom" antenna.  Of course "Windom" was a misnomer; it was and still is an OCFD antenna. 

• Die FD 4-Windom-Antenne, by Fritz Spillner, DJ2KY, QRV magazine, December 1971, p. 13-20.