NEC-2 has been in constant use for about 30 years, and it's used daily
to design antennas for a vast multitude of purposes -- antennas which
are used by millions worldwide. It has been shown, over and over, to to
agree closely with measured results. This shouldn't be any big surprise,
since it uses fundamental equations which have been known and verified
for over a century. There are, of course, some limitations to its
abilities, and situations where it gives erroneous results. The vast
majority of these have been found and well documented. And like any
modeling system, computerized or otherwise, a good deal of skill can be
required to match the model with the real object.

Anyone who claims to have discovered principles which are beyond those
incorporated in current programs has a heavy burden of proof to bear.
The very first hurdle to overcome in order to gain any semblance of
credibility is comparison of carefully and professionally measured data
with results from a carefully and professionally created model. If the
differences truly are unexplainable by known deficiencies, then further
investigation is surely warranted. Vague claims, speculations, and
arm-waving with a total lack of any quantitative data are far short of
what is needed to gain the attention of anyone who has seen, over and
over, the successful results these programs routinely provide.

Roy Lewallen, W7EL