Kraus (2nd edition, p. 375) gives a different answer.

Interpolating from the diagram on p. 375 (assuming length/diameter = 472)
it
is about 90-j250.

Why the difference?

==============================

The program takes into account antenna diameter. Does Kraus? And is he on
the same band? Is he at the same height above ground? What sort of ground
or radial system does he have? Have you interpolated correctly? Have you
understood what Kraus is saying? Is the loading coil in the same location?
Is the feedpoint at the same place. Are you comparing like with like?
Spend more time thinking about it.

Is Kraus infallible? Could be he's wrong again.

Who's Kraus anyway? ;o)
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Reg