The only real way is to try it and see what happens. But it isn't guaranteed.
While adjusting the length of the whip alters the resonence, the base loading
coil has two parts, or is a tapped inductor (although some use a capacitor
instead). The "matching" part of the inductor, between the coax and ground,
may or may not be correct for large excursions in frequency so altering the
length of the whip may or may not work. Nothing to lose by trying, it's fun to
learn!