Art wrote:
"So just comparing the forward and rear lobe we have only achieved 50
per cent of our objective and this is not counting other losses."

Adding a director or reflector in the plane of a dipole can make it
nearly unidirectional. It will have forward gain over the dipole alone.
Adding more directors can increase forward gain. Losses of the radiator
and parasitic ellements to heat in them can be made small and antenna
efficiency high.

Best regards, Richard Harrison, KB5WZI