As for the vertical bazooka antenna that you find the formulas for at the web
site given, the length for around 120 megahertz would be slightly longer than
five feet. It would be to long to install in the vertical stabilizer, without
the plastic pipe extending 15 or 16" above the rudder.
It could be installed midway between the seat and tail, but would still
protrude above or below the body. It could be installed horizontally in the
wing or horizontal. Stabilizer, but all FAA towers and com frequencies are
vertical polarized. It might work ok, but vertical would be better.
If you are an EAA member, you can look at several past antenna articles in
Sport Aviation magazines.
Tom wb4ryr