Jeff Liebermann wrote in
:

Jeff,

You are treading down a well worn path.

There is a flaw in thinking that the shield of the coax below the bottom
of your nominal dipole does not carry significant current on the outer
surface. Whilst you are trying to account for the current distribution
on the nominal dipole, you are ignoring the common mode current on the
feedline.

The antenna will 'work' and you may be delightedm but if you expect that
it will have very low VSWR based on formula dimensions, I think you will
be dissapointed.

You might obtain better feedline decoupling by some form of common mode
choke.

The failure of the sleeve to effectively decouple the dipole is the
reason why several antennas don't work as thought. King gives some hints
that the relative diameters of the conductors bears on operation.

Owen