Airport Extreme - Can't Connect to 5Ghz Wifi

Recently I purchased a AT&T MiFi device called a UnitePro. This device allows me to broadcast a a dual band wifi if wanted. It also allows one or both of those to be 2.4Ghz or 5.
After doing some research and discovering that the 5Ghz band can be faster, I wanted to connect to it from my iMac. I have been unable to do so since first attempting...
I have a mid 2010 27" iMac i7 which came with a built-in AirPort Extreme  (0x168C, 0x8F) wifi card.
So I have done a bunch of research on this issue and I think I understand the problem that I am having, however I do not understand what (if any) my solutions can be. It appears that when an AirPort interface is turned on, it listens for 802.11d beacon packets, and those contain what it called a regulatory domain field. Then the Airport driver uses the first valid regdomain setting it sees. In my case it is picking up a strong beacon from a neighbors house. The problem is that his router is set with a country code of ZW (Zimbabwe)! This my problem.... Zimbabwe's regulatory laws prohibit the routers to support channels above 13, or at least this one does, I don't fully understand it, but I get the gist.
So what this means is that I can not use my iMac to connect to my new router because quite simply the channels that 5Ghz broadcasts on are not even available.
I know this has been a topic of discussion in the past, but I couldn't find a good answer as to what to do. So... What can I do to get my 5Ghz network working?
Thanks in adavance!
Cheers

It sounds like when the Internet went down, the modem got "confused" and didn't remember that the 802.11n AirPort Extreme Base Station (AEBSn) was connected to it.
Please try the following:
o Power-down the modem, AEBSn & computers. Order is not critical.
o While the power is off, check to see if the modem employs a backup batter. If it does, temporarily remove it, and then, replace it.
o Power-on the modem. If it has one, press and hold the modem's reset button for at least 3-5 seconds. After power-up or reset, wait at least 10-15 minutes.
o Power-on the AEBSn; wait at least 5-10 minutes.
o Power-on the computer(s).
Your computers should be able to access the Internet (& access web sites) now. Please post back your results.

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    OS 9, OS 8 & System 7
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    iPod
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