Cecil Moore wrote:
AI4QJ wrote:

You can take advantage of the "information" provided by the
transmitter, with reference to its Z0 match condition, by merely
observing the maximum available output power.


The point is, it can be monitored *at the antenna*
thus proving that a tuner does indeed have an effect
at the antenna.

An effect "at" the antenna is not the same as an effect "on" the
antenna. Which did you mean in your OP?
Alan