The ORIGINAL TEXT as I first encountered it is reproduced below.
THE SKELTON CONE ANTENNA
One of the most unique home brew HF antennas around today is the Skelton Cone. This antenna will operate on 10M - 80M and is reported to show gain above 40 meters.
There is a lot of literature on the Cone. It first appeared in in the RSGB Handbook ( 3rd edition, pp 387), and again in 73 Magazine ( Aug. 1969, pp 133 ) and was deeply researched by the late K6LV, in many different configurations.
The antenna looks very much like two G5RV antennas on one feed line. Basically it is. It's just a G5RV that has been broad banded by adding additional legs and spreading them apart.
The feed point can be set 38-48 feet high, with the legs sloping down
to about 18 feet at the ends. The 33 degree angle between the leg pairs
works out to be about 28 feet. Also, the feed point separation should be
set at 4 inches wide. These configurations are not absolute. The Cone is
very forgiving in different configurations of installation.
Feed the cone with 38 feet of 300 to 600 ohm twin lead connected to the balanced output of a good tuner. Note. Feeding the cone with a balun is not recommended. Add 33 foot increments of feed line if more is needed above the basic 38 feet.
Performance reports are unique. Computer models show the highest gain
of the cone towards the 10M end of the scale, but the antenna really shines
on 40 and 80 meters. In addition, the antenna exhibits the best points
of both horizontal and vertical omnidirectional antennas, with none of
the apparent drawbacks.