On Sun, 17 Jun 2007 09:25:43 -0700, John Smith I
wrote:

Anyone have a reasonably accurate equation for such?

This does not work for structures with any significant size in
relation to wavelength.

A simple example reveals this with your inductance formula for a 1mm
thick 10 meter whip in the 20M band which suggests it "should be" 50.8
(whatever units your formula reveals). Experience informs us it is
not. This formula similarly fails throughout HF (and in fact would
lead us to the conclusion it was capacitive, not inductive at all).

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

73's
Richard Clark, KB7QHC

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