NEC-LIST: thin-wire general EM equations

Gentlemen: it seems that all textbook introductory treatments of freespace
dipole impedance and EM fields limit themselves to dipole lengths less than
about a half wavelength. This is related to the simplifying assumptions
made when defining the Hertzian dipole. I am looking for a general set of
equations, assuming sinusoidal current distribution on thin wires, for the
input impedance seen by a source located at the center of the dipole. I am not
interested in any MoM approaches, just the plain old CI and SI expressions,
requisite integrations, etc. Surely there must be a general equation for
this that is valid for any length of dipole?

PS: when i say thin wires, i do not necessarily mean infinitesimally thin
wires. g

Grant W. Bingeman, P.E.

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