WIFI network performance - lid closed vs open

Hi,
I have a house that is not ideal for wifi. In particular, my office is an extension off the kitchen which has a solid brick wall between it and the rest of the house. Through 2 airport extremes, i get great wireless N signal everywhere in the house except this office. So, i added a 'N' airport express at the base of the stairs to this office and 'extended' the network.
So, i have 2 macbook pros up here. One is running on batteries, sitting on my desk, lid open. It is showing a rate of 108, signal -66 and noise -88 in the advanced wireless clients section of the airport express which it is getting it's signal from.
The next is closed and connected to a LED 24" cinema display. It is right next to the other MBP. It is showing a rate of 41, signal -80 and noise -93.
Why such a huge difference? Would it be because the lid is closed, it is connected to the display or a faulty macbook?
thanks.

In the non-unibody MacBook Pros, the antenna is in the lid, and it's under the rubberized cutout in the lid that you see just below the screen along the middle of the hinge, and it wraps around the hinge to the back. The rubber cutout is necessary because without it, the aluminum lid and case basically blocks signals.
When the lid is closed, the rubberized part that is visible is along the back, so theoretically, the antenna should still be exposed, but maybe the antenna orientation is just different enough when closed that it affects the reception. I don't really know how it's laid out under there.

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