We've use the Advanced Aircraft Electronics L2 antenna on several
installations, with excellent results. * This antenna mounts
internally in the fuselage tail boom. *(won't work with carbon fiber
in the fuselage though...)

I second the L-2, di-pole antenna suggestion, all inside with nothing
sticking out to get ripped off. Carve a1"X 1"X4" balsawood block so
that it matches the inside curve of your non-carbon fuselage, then
glue the antenna vertical to the flat side and the curved side to the
inside aft fuselage. Keep it about 6" away from metal objects like
your elevator push-rod, etc. Secure the RG-58 lead so that it can't
get tangled with controls and you're good to go.
Hope this helps,
JJ