At my university, there are multiple access points, all broadcasting on the same SSID with both 2.4Ghz (802.11b/g/n) and 5Ghz (802.11a/n) radios. In the spot where I'm having this problem, my Mac can see about a dozen of these access points with the same SSID. However, the problem is that I can't specify which one it will connect to. Here, there is substantial interference on the 2.4Ghz band, so it is unusable. My MacBook Air will usually connect on the 5GHz band, but it occasionally tries to switch to the 2.4GHz frequency on the AP, causing my connection to cut out. Is there any way I can force my Airport to connect to a particular channel or access point? On my Windows machine I solved this problem by disabling the 2.4Ghz radio so that Windows would be unable to see those APs, but this doesn't appear to be possible on the Mac. I've tried searching for a solution without success.