Those are really good links William and Dean! Not only do these little flat panels need to bee pointing in different directions but they also need to be rotated differently up to 90 degrees for different polarizations. (some straight, some 45 and some 90).
So it will be interesting to find some where the bracket easily allows this.
Dean, I am not sure that is the one HP use. 16 degrees or 8 degrees seem like a very small pattern. I would expect to see panels with around 70 degree to 100 degree patterns. 16 or 8 degree seem like direct links to me but I defer to someone with better knowledge in these matters.