Is there a directional issue with the 24" iMacs?

I am having a problem with a 24 inch iMac in a garage apartment next to my house. I have an airport extreme on the far side of my house, and an Airport Express on the near side of the house in a window facing the garage--set up to extend the Airport Extreme. The Express is literally 6 feet down and 20 feet over from where the problem iMac is. There is a metal roof, so I put some of the blame on that. But here is what fixed mine.
The iMac was oriented at a 90 degree angle, so in essence, the long thin profile was facing directly toward the airport. After lots of trouble with good signal one minute and no signal the next, one day I decided to turn the computer 90 degrees, so that the back of the iMac directly faces the Airport. Now I get a consistent all-bars signal.
I haven't been able to find anything on the directionality of the Airport in these large metal clad iMacs. Anyone know anything about this?

Metal file cabinets, and piping in walls can affect the wireless signal.
2.4 Ghz wireless phones can too.
Microwaves can as well.

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Is there a directional issue with the 24" iMacs?

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