Thank you for the suggestions.
My casual use of "efficiency" of an antenna did not add anything to the slide show.
I mainly wanted to show the relationships of
Reflection coefficient, return loss, SWR, impedance, R and X, and phase
But without getting too deep into the weeds and the math of complex numbers.
When a dipole is operating at its resonant frequency, the current and the voltage at the feed poin are in phase.
WHY?
Most hams I have talked with cannot tell me WHY that is so.
And why does operating below resonance get you into capacitive reactance?
Why does operating above resonance get you into inductive reactance?
Why at a resonant frequency do these two cancel?
And, what can you tell by just looking at a Smith Chart graph of an antenna?
That was what I wanted to concentrate on.
And I admit, I am a rookie at this stuff, but learning fast.
Agn, TU for suggestions
Barry k3eui
Barry K3EUI