John Ferrell wrote:
. . .
Modeling programs do not consider the radiation from the loading coils
but field measurements do.
. . .

Modeling programs do indeed include radiation from the loading coils,
provided that they're modeled as a wire helix rather than by use of the
lumped load object. EZNEC and NEC both have methods of automatically
creating a helix, making this process very easy. I believe most other
NEC based modeling programs also have this capability.

Roy Lewallen, W7EL