On Thu, 17 Feb 2011 19:39:19 -0600, tom wrote:

On the other hand the null for this antenna array would need to be maybe
90dB or better to be really useful.

Here we have three (3) antennas, and as we all know they are not in
isolation.

Somewhere, there's a nearby (or near enough) overlooked reflective
surface that disrupts that oh-so-absolutely-necessary symmetry.

73's
Richard Clark, KB7QHC