J. B. Wood wrote:
Roy is absolutely right in a previous post that an antenna vendor is most
likely blowing smoke by proclaiming that his/her antenna can't be modelled
by a method-of-moments program like NEC. (My favorite antenna "myth
busters" using NEC are Drs. John Belrose and Gerald Burke). Sincerely, and
73s from N4GGO,

The problem that EZNEC has with this antenna, as I understand it,
is that the same pair of parallel wires has common-mode current
in them on some frequencies resulting in a high VF and differential
mode current in them on other frequencies resulting in a low VF. I
don't know how to model changing VF's with EZNEC without changing
the physical length of the wires as frequency is changed.
--
73, Cecil http://www.w5dxp.com