TC Signal low but location is very close

I just fired up iStumbler to check my wifi. Signal strength is varying between 40% and 60%. This seems very low since the TC is only about 20 feet away from my iMac.
My settings:
802.11n only
Channel 3 (no other networks in my area use channel 3)
WPA2
Any ideas? I would think with the close promixity, my signal strength should be a lot higher.

Jason Justice wrote:
I picked 3 because there are at least 5 other networks using 1, 6 and 11 in my area. There are no walls. Pretty much perfect line of sight from the imac to the TC. I tried 5ghz and it got worse.
By moving to 3 you actually get interference from wireless on both channel 1 and channel 6.
So you have perfect LOS across 20' and cannot get a signal at 5ghz.. that is very poor. How old is the TC? How old is the imac? Can you find someone with a laptop to do signal strength for you as well, to figure out if the issue is the TC or imac?? Do you have anything running on 5ghz that could interfere like cordless phone?
Try and break the issue down to which end is the problem and then you can resolve it by using some extra hardware or getting a replacement. For instance EOP adapters are becoming cheap and plenty good enough to beat wireless. They are also much more reliable than wireless in most cases.

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If any of the above solutions work, please post back what solved your problem. It will help others with the same problem.
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TC Signal low but location is very close

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