I am currently evaluating a trap antenna design that is described in the
19th edition of the ARRL Antenna book. There are two different dipoles
represented there: one using a 60pF capacitor and twin-lead feed, the other
using a 100pF capacitor and coax feed.
The described advantage of both of these antennas is that they operate on
80, 40, 20, 15 and 10 meter bands to some degree. I have modeled these with
little success using EZNEC. I expect that this is partly because I do not
know how to add in the resistive component of the trap design. Please also
note that I only have the DOS version of EZNEC.
Any way my reason for all this is that I would like to build a portable
vertical antenna for field use that has the touted characteristics.
Obviously I would need to provide and attachment point for guy wires as well
as an appropriate number of radials. My expectation is that the radials
would be mounted about 2 feet above rock at the top of a mountain (East
coast definition) where there is little or no support for a horizontal
antenna.
My question is: Does anybody know of a commercially available antenna that
might serve?
I have looked at a couple and find that they are very expensive (>>$100) and
very short (<30 feet tall).
Alternate question is: Does anybody know why EZNEC does not seem to confirm
that this design works well on all 5 bands?
Fran
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