Greg Milligan wrote:
Im slightly puzzled by your last statement. Why will twisting it have any
affect?

Twisting tends to expose both transmission wires to the same environment.
For instance, if you ran one wire 0.5" away from sheet metal and the other
wire 1.5" away from the same metal, you would unbalance your currents
because of the metal's effect on the closest wire.
--
73, Cecil, W5DXP