Richard Clark wrote:

...
Such formulas are generally useful at 1Khz (or where otherwise
specified).

73's
Richard Clark, KB7QHC

Yes Richard, those are the exact problems I am running into when
attempting to put together a small utility to get me in the ballpark on
some antenna computations/designs ...

I tossed that question out fishing for responses which might provide
methods, ideas, clues, hints on accomplishing the task ...

But, you reaffirm the difficulties in obtaining suitable accuracy ...

Regards,
JS