After upgrading to Mountain Lion, I cannot connect to my Airport Extreme on the 5GHz band (2.4GHz works fine)...what's going on?

I have been having intermittent/no wireless success on the 5GHz band of my Airport Extreme.  I'm on an iMac early 2008.  It was working fine before upgrading to Mountain Lion.  I have tried many things (deleting the wireless network, readding it, changing settings on the AirPort Extreme, deleting the 5GHz network on that and readding it, running diagnostics) but nothing has fixed it.  I can switch to the 2.4GHz band and it works flawlessly.  This must be a software problem since it only started happening when I upgraded the OS.
Any help would be appreciated.  Thanks!

No it isn't, I have tried 4 different mountain lion machines connected to a 5Ghz and it works just fine. It is with your machine hence we need to fix it
create a new location and see if that fixes your issue, If not trash Macintosh HD/Library/System Configuration
That is a folder so trash it > restart the computer > create a new location

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