Low Wireless Signal When Using 10.6.1

Since upgrading to SL, I have been unable to get anything more than 2 bars of wireless coverage. This includes using a computer situated with 10 feet of my Airport Extreme with no sources of interference. I have tried older routers that have similar results - horrible wireless signals.
Is anyone else suffering through this?

Is you wireless performance/distance from computer definitely affected negatively by the apparently low signals? If not, then I would not worry about the apparently low signal strength.

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