My Time Capsule's 5GHz network does not appear as a network any longer. Airport utility is 5.5.3 and iMAC is 10.7.1 The TC appears to be configured correctly in the utility screen.

My Time Capsule's, only the 5GHz network, does not appear as a network any longer. Airport utility is 5.5.3 and iMAC is 10.7.1 The TC appears to be configured correctly in the utility screen. This began sometime after upgrade to 10.7.1 however this does not explain why either of my iPAD's does not see the 5GHz network.

Wish some Apple folks would chime in...
Apple is not here. Even if they might rarely monitor these boards, they will not respond. We're all users, just like you.
Suggest that you open Macintosh HD > Applications > Utiltiies > AirPort Utility
Click Manual Setup
Click the Wireless tab below the icons
Click the Wireless Options button
Check one more time to see if you still have the 5 GHz Name option enabled. If not, enter a check mark and click Update to save the new settings.
If 5 GHz is enabled, temporarily disable the setting and Update. Then go back in and enable the setting again.
If you still cannot "see" the network from any device, about all that you can do at this point is reset the Time Capsule back to factory defaults and try the configuration again to see if it will "take". Lion is causing some strange issues, and this may be another.
If this is not successful, then it's time to contact Apple support or arrange a visit to an Apple store to let them take a look

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