Are there any new imac wifi connectivity fixes?

I continue to lose wifi on my mid-2011 imac.  all other devices including pcs and phones/ipads in the vicinity do fine on my airport express wifi signal...
I'm running ox 10.8.3.
I've tried all the fixes...new networks, renewed DHCP lease, etc
somebody help! 

Have you changed the wifi channel on the router? It's worked for some.
Here's a catch-all of some things that have helped some people. It sounds like you've tried a few of them, but the links may offer other ideas - in no particular order:
Check wifi security - if it's WEP change it to WPA or WPA2 (preferably, as it's more secure)
Change the wifi channel on the router
Create a new Network Location: http://support.apple.com/kb/HT5289
Reboot the router
Also take a look at this link and the links within the article for other ideas. They mainly reference Lion, but still seem to be relevant to Mountain Lion:
http://osxdaily.com/2011/11/06/lion-wi-fi-problems-solution-mac/?utm_source=feed burner&utm_medium=feed&utm_campaign=Feed%3A+osxdaily+%28OS+X+Daily%29&utm_conte n t=FaceBook
...and this link:
http://osxdaily.com/2012/11/30/resolving-stubborn-wi-fi-connection-problems-in-m ac-os-x/

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