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I found that my aTV, MBP (Lion) and iPad 2 were always connecting to the 2.4 Ghz network with my dual band Airport extreme as well. Setting them separately, I have forced it to 5Ghz. I live in a condo building so 5Ghz has far less interference, so I don't understand the reason for the behaviour.

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Try this on the MBP:

* Connect to the 2.4Ghz network

* Hold "Option" and click the wifi icon in the top menu

* Note the "Transmit Rate"

* Repeat this for the 5Ghz network

When I first setup my Time Capsule I noticed that my Mac often times was attaching to the 2.4Ghz network. At that point I separated the networks and did the above.

Low and behold, each time the Mac picked the 2.4Ghz network it did so because it had a higher transmit rate than the 5Ghz one in a given location.

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