Cecil -

The link below shows the NEC-2D results for the 3-m monopole whose geometry
I posted earlier -- at its frequency of first self-resonance, and at 3X that
frequency.

We don't disagree as far as current distribution is concerned, but maybe in
the belief that such a helix at an operating frequency that is 3X its first
resonance has a practical benefit for users.

The reason that it may not is traceable to the radiation resistances at each
frequency w.r.t. a fixed amount of antenna system loss.

http://i62.photobucket.com/albums/h8...d_Harmonic.gif