Jerry, KISS

The best vertical is an approximately vertical wire, rod or mast, as tall as
possible, with a set of shallow-buried ground radials, a dozen or so in
number, with a length roughly equal to antenna height. The whole
contraption, if you can manage it, being well away from man-made buildings
and dense tall trees.

Any experimental modifications, such as loading coils, will result in very
minor changes, hardly noticeably better on some bands but inevitably worse
on others.

The most important component in the system is always the tuner, next the
ground system, and finally the antenna wire. KISS again!
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Reg, G4FGQ