"Reg Edwards" wrote about the elevation pattern of a loaded vertical against
ground as being ~ the same as that of a longer, unloaded vertical, per
Terman:

No, it doesn't ! You have been warned once before
about quoting Terman as the Bible.
______________

I wonder, then, what your basis is for saying so.
At least I give a source.

Terman also publishes a formula to calculate the elevation pattern of a
shortened vertical with a top-mounted capacity ring, driven against
ground -- but it's too much to post here without mathematical notation. The
formula was credited by Terman to George H. Brown from his "A Critical Study
of Broadcast Antennas as Affected by Antenna Current Distribution" published
in the Proceedings of the I.R.E.

Terman also says that inserting a coil a bit down from the top of a
shortened vertical gives results equivalent to using a top mounted capacity
ring.

RF