The phase shift along a coil, an inductor, considered as a
transmission line, obviously depends on what it is terminated with.
It much depends on frequency.

In the present context, the termination of the coil is the input
impedance of another transmission line consisting of a rod or length
of wire, or a capacitance hat, forming the remainder of the antenna.

To the participants to this discussion, just think about it. The
behaviour of the coil depends on the behaviour of the rest of the
system.

On the other hand, a coil has certain fixed parameters which are
independent of the rest of the system.

It is a good idea to restrict analysis to the resonant frequency of
the system. It assists with simpification and understanding of it.

Tonight, I've switched to Western Austalian dry white.
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Reg.