My MacBook Air can't see 5 Ghz "N" signal?

Any reason for this? My iMac can see it.
I've also posted in another forum that while connecting to my AEBS via the 2.4 Ghz signal, my MBA is not achieving download speeds nearly comparable to my desktop iMac (connecting my iMac wirelessly to the AEBS).
The networking settings are the same for both machines, but my MBA is slogging with download speeds, which are reporting to be slower (by a factor of 2x) than my upload speeds (my iMac speeds are much faster and near parity on the up-and down-load rates).
I'm connecting to the internet via Comcast 50 service, which is connecting to a Linksys WRT610n router. The AEBS is connected via ethernet.
Any thoughts??

Welcome to the discussions!
A few thoughts...
The higher frequency 5 GHz signals are absorbed by walls and any obstructions much more quickly than 2.4 GHz signals, so that may be a contributing factor in the question about not being able to "see" the 5 GHz signal.
If the MBA and iMac are in similar locations, the information in your post indicates that the wireless card in your MBA may not be performing up to par. This may or may not be related to the 5 GHz problem.
I assume you've done the standard things like restarting the router, your computer, deleting your computer wireless connection and password in Keychain Access and then establishing another connection, correct?

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