Dave, K8MN wrote:
"Wouldn`t you like to be a fly on the wall in the Patent Office?"

My perception of Art`s latest is a dipole composed of elements
consisting of 1/4-wavelengths in effect but constructed of helices of
1/2-wavelengths of wire.

My 20th edition of "The ARRL Antenna Book" on page 16-13 says:
"The general approach has been to use a coil made from heavy wire (#14
or larger) with length-to-diameter ratios as high as 21. British
experimenters have reported good results with 8-foot overall lengths on
the 1.8 and 3.5 MHz bands."

Also, on page 78 of "All About Vertical Antennas" by William Orr, W6SAI
and Stu Cowan:
"In general, a half-wavelength of no. 14 formvar-coated wire is spirally
wrapped around the form, with turn spacing approximately equal to the
wire diameter. This amount of wire will approximate a quarter-wave
resonance."

The Unwin Antenna seems to be in Richard Clark`s phrase: "Prior Art".

Best regards, Richard Harrison, KB5WZI