On 11/3/2016 3:54 PM, Tom Osborne wrote:
> I was just wondering if someone had ever done this.
Yes, Force 12 has done it for years. The C3 series of antennas are
overlaid 2 elements for 20/15/10 meters with parasitic coupling from
the 20 meter DE to the 10 and 15 meter DEs. The general concept of
the C3 is documented in the ARRL Antenna Book (23 rd Edition) pages
11-27 and 11-28.
There are several other examples of the technique. It is rather easy
to design such an antenna - typically DE/Ref for 20 and 15 and DE/Dir
for 10 meters - with modelling software.
Specific dimensions will depend on the diameter of the tubing used
and mounting/insulating methods.
73,
... Joe, W4TV
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