Extremely slow wireless internet thru Time Capsule

My iMac is connected by wire to Time Capsule and internet speed is great 30+MB/s.
My Mac Mini (approx 60'from TC) connects wirelessly through router to internet. Speed was fine at first and then started slipping. Now near zero to 3MB/s. Tried reboot - seems to help but only momentarily.
Any clue what is going on? If it's just too far away - is there any solution short of moving mini (which isn't workable)? If it's too far away - why did it work fine for several months?
Completely frustrated - Please help!

dencamp wrote:
My iMac is connected by wire to Time Capsule and internet speed is great 30+MB/s.
My Mac Mini (approx 60'from TC) connects wirelessly through router to internet. Speed was fine at first and then started slipping. Now near zero to 3MB/s.
I'd check the strength of the signal and noise you're seeing. On your mini launch AirIPort Utility, then double-click on your base station on the left to enter "manual setup" mode. Pull down the "Base Station" menu and select the "Logs and Statistics" item. In the resulting window select the "Wireless Clients" tab. What values do you see for "Signal" and "Noise" for the mini? This discussion post
http://discussions.apple.com/thread.jspa?messageID=10329543&start=1
describes how to evaluate the relationship between the signal and noise numbers.

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