@ TheRing,
Interesting in this Wifi world is the explanation how Mimo works. Rather Dan pushing the Third antenna closely to the other (Black and white) it’s in mine opinion better to place it with the end closely to the end from the HDD in de same direction. I did so and have better results then closely to the other position you mention!
For the people Who want to understand more about MIMO and N maybe this is a good explanation.
http://www.konvergenz-forum.de/white_paper/aruba_white_paper_on_802.11n.pdf
Thanks @ TheRing
Grtz, from Maastricht (The Netherlands)