John Doe wrote:
Could I use the whip configuration as the center load coil, and just add
some more wire to the top end of the whip and more wire to the bottom end??

Using more wire would make for a more efficient antenna
but you would need to short out some turns on the 160m
coil which causes a lowering of the coil Q. Ideally,
you would just use (wind) a lower inductance coil, one
with the exact amount of inductance needed. With a
large top hat and more vertical wire, the size of the
coil is considerably lessened. But shorting out the
unneeded turns on a coil is a time honored tradition.
--
73, Cecil http://www.w5dxp.com