Cec,

Can't you see that the first resonance corresponds to the parallel
resonance of the inductance with its stray capacitance, and is what
you call its 1/2-wave resonance?

At your 1/2-wave resonance the input impedance is very high regardless
of what the load impedance is on the other side. It does not behave
anything like a transmission line.

Higher frequency resonances, IF they exist, will be above and outside
the amateur bands and of no interest to anybody.

Interest lies only in either side of the first resonance. That is in
the wide band of frequencies at which the impedance is greater than
1000 ohms or so.

See program SELFRES3.
----
Reg.