Upgrade to Leopard = No Wireless Networking

Hi,
I upgraded my Mac Mini (1.83 GHz Core 2 Duo) to Leopard the other day. Took it to 10.5.2 right after the upgrade.
Everything worked flawlessly for about 2 days.
Then the AirPort networking started dropping it's connection. I have a Wireless Router setup right beside the Mini which it now just barely picks up (1-2 bars) and drops the connection every few hours.
And I can no longer browse / see any of the other wireless networks in my neighborhood.
My MacBook which I also upgraded to Leopard is working fine. Full signal strength and can see the 5-10 other networks in my vicinity.
The Mac Mini was also working perfectly fine before I upgraded to Leopard.
I tried deleting the com.apple.airport.preferences.plist as some posts suggest but that doesn't work. There seems to be other Mini owners with similar problems but no solutions.
I don't want to revert to 10.4 ... any suggestions?

Have a look at the thread at http://discussions.apple.com/thread.jspa?threadID=1506687&tstart=0 for some additional comments regarding this issue, and a commentary from macfixit.com relating to it.

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