Buck wrote:
. . .
I don't remember the dimensions, but I remember that in the
instructions, EZNEC could not make accurate measurements with parallel
wires within a certain distance like 8-10 inches.

(someone correct me here.)
. . .

That's not correct. However, it is essential to align the segment
junctions so they're directly across from each other when modeling
closely spaced parallel wires.

Roy Lewallen, W7EL