Yeah, Ed, I certainly don't mind doing a few quickie models here and
there, happy to do it.

It's worth ordering it, though, when you want to do something like I
did and model the pattern of your your five element 2m beam 16 inches
below your 6m moxon rectangle in the presence of your HF doublet and a
nearby aluminum roof, and generate the pattern for eight azimuth
directions.

It's a great tool to have if you like building antennas, especially if
you have complicated, site-specific improvements you might want to do.

Dan