"Cecil Moore" wrote
Dave Platt wrote:
I believe that you could probably get a fairly effective
pattern-warping by using a non-tuned reflector which is significantly
longer than your collinear radiator.

Passive non-resonant elements have very little effect.
That's what allows a lot of multi-band beams to work.
_____________

As a point of reference, the radiation patterns of sidemounted FM broadcast
transmit arrays are affected by a non-resonant mounting structure (the
tower) -- especially for vertical polarization. Measured patterns from the
manufacturer's test ranges demonstrate this, as do the NEC-2 studies in
several of the papers on http://rfry.org .

RF