Dave,
Just so you will know in the future, the dipole is
a dipole, balun or no balun. It's still a balanced
antenna, but fed with an unbalanced feed line.
Both the dipole and a vertical full wave loop will
work just fine without a balun. It does make a slight
difference in the shape of the radiation pattern but
you will never know it. Do you really mean a balun,
or do you mean a coaxial choke? At HF either will work.
'Doc