Jim Lux wrote:

tedious, but not complex. Like all Finite Element approaches, you
basically break the problem up into little tiny chunks and rigorously
apply basic laws of physics. Charge is charge.

The challenge is not in the theory of operation, but in the practical
implementation.

. . .

The last time I read any of Art's postings, he was using AO, which is
MININEC-based. MININEC has a number of peculiarities due to choices made
in its implementation, including problems with close spaced parallel
wires, wires connected at an angle, and very simplified ground model.
(See "MININEC: The Other Edge of the Sword", _QST_, Feb. 1991 for more
detail.) NEC-2 and NEC-4 also have peculiarities due to their
implementations, but ones which are different from MININEC and in some
cases from each other.

Roy Lewallen, W7EL