The antenna I made for the C-Crane FM Transmitter is not a dipole.
To attach a dipole we would need access to the ground side of the transmitter circuit, and the C.Crane does not have an easy way of attaching to RF ground.
Both the power ground and audio shield are filtered by inductors to keep RF from flowing.
Therefore the only RF output normally available is the telescopic antenna.
What I have is a wire taped to the wall in the shape of an L.
The elbow of the L is attached by clip-lead to the collapsed telescopic antenna laying horizontal and shortened.
Each leg is approx. 1-quarter wavelength of my operating frequency.
There is a field output loss of 2 dBu, but the vertical-horizontal effect eliminates multipath inside the building, unless I move something to certain locations which cause multipath.
With the normal vertical antenna I cause heavy multipath interference just by walking around.
The Mid-fed L does not increase range.