"larry d clark" wrote in message m...
i've been modeling various antennas using 4nec2
and was wondering just how accurate the data in
the radiated-power and structure loss fields actually
is?

They should be correct, because the data is extracted directly from
the data generated by the Nec2d engine.
In case you should not trust the Nec2dXS engine you can switch from
the Nec2dXS to the default Nec2d engine. You could also run the
examples from the Nec2 user-guide and check the results.

Or compare the results with the (demo) versions of commercial packages
like for instance Eznec or Necwin+.

Let me know if you think there are (major) differences.

Arie.