Reg Edwards wrote:
"Can any of you guys tell me which of the waves on the antenna does the
radiating - is it the forward or is it the backward wave?"

I agree with Cecil, "So the answer is both."

Think of a traveling wave antenna, the rhombic. When it is properly
terminated, there is no backward wave and the radiation pattern is
unidirectional. Eliminate the termination resistance and a total
reflection occurs at the antenna`s far end. Now the rhombic is a
bidirectional antenna.

Best regards, Richard Harrison, KB5WZI