In the late 1950s, QST magazine featured a number of antenna designs.
Many of these designs became the commercial antennas or antenna parts,
that are sold today by Hy-Gain/MFJ, Hustler/Newtronics, Mosley, Cushcraft/MFJ,
Butternut/Bencher, Reyco/Unadilla, Mini-Products/TCM Communications, etc.
In 1957, Ralph Rosenbaum, W5ECP designed the 20 meter Wonder Bar antenna.
The W5ECP antenna project was published in June 1957 issue on pages 44-45 of QST magazine.http://p1k.arrl.org/pubs_archive/38975
Here is an updated DIY Build of this 20 meter Wonder Bar antenna.http://www.hamuniverse.com/20meterwonderbar.htmlIt was a scaled-up version of E.T. Bishop's K6OFM's 10-meter "Wonder-Bar" antenna
published in November 1956 issue on pages 32-33, 138 of QST magazine.
The E.T. Bishop design used readily available Biconical TV antennas to fabricate this antenna.
Since it looked like a common 1950s TV antenna, neighbors did not complain, in this era.http://p1k.arrl.org/pubs_archive/38488
Updated DIY Build of this 10 meter Wonder-Bar antenna.http://www.hamuniverse.com/wonderbar.html
2-Element Wonder Bar beam antenna, by G.G. Ryan, W5JMQ
QST magazine, February 1957, p. 43 and 134, WonderBar 2-el beam on a 5-ft boomhttp://p1k.arrl.org/pubs_archive/39393
The Butternut Butterfly
antenna, patented in 1985 by Donald Newcomb(sk),
shares some concepts/design elements with the 1950s single band Wonder Bar designs.http://www.bencher.com/pdf_download.html