Bob, I see what you and Shockwave see in the CST model for the Vector, where constructive contribution is produced with the top 1/2 wave and the bottom 1/4 wave. It looks pretty convincing to me. I just can't prove it using Eznec. Thus far nobody seems to want to discuss why the currents it sometimes produces are not always consistent with expectations.
Eznec can and does indicate correct phasing and current flow in my vertical stacked collinear 1/2 wave however, so I know it can produce the affects in that simple construction using the proper phasing stub. <gotproof>
I can also make this same antenna look bad in this regard...just by changing how the wire ends are positioned in the model. 
Can you, or Shockwave tell us what the length of radiator and radials were in this Sirio CST model?
Was it a model of their New Vector 4000 per chance?
You may have posted this information before, but could you tell us approximately how tall your Vector radiator was from the feed point to the tip, and how long were the 4 radials...when you noticed the best performance at a distance?
Homer of Booty Monster, I think you've both had conversations with Bob about his Vector, do you know generally what any of his dimensions were, in case he doesn't see this?
