Tony, I0JX wrote:
"Then, your "Zo-matchpoint" must be comething else which I cannot figure
out."

I`ll guess with Tony that in a made-up case of a 50-ohm antenna and a
50-ohm transmitter connected by a 1/2-wavelength of 300-ohm twinlead, we
have a Zo-match to 50-ohms because the twin-lead, mismatched at both
ends, still looks to source and load like 50-ohms.

Best regards, Richard Harrison, KB5WZI