Correction:

Roy Lewallen wrote:

(Last paragraph)

Important for what? No matter how long the coil or how many turns of the
wire, a small (in terms of wavelength) inductor won't act like a slow
wave structure or an axial mode helical antenna. . .

The word "diameter" should be added:

Important for what? No matter how long the coil or how many turns of
the wire, a small *diameter* (in terms of wavelength) inductor won't
act like a slow wave structure or an axial mode helical antenna. . .

Roy Lewallen, W7EL