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This is one of my client's APs. It's mounted on the external wall of an office facing a large warehouse. On the laptops we see signal fluctuating from full signal to 3 out of 5 bars. I decided to run InSSIDer 2.0 and this is what I can see.

It's using this AP:

Any thoughts on what could cause this? Interference? They had two 2.4 Ghz cordless phones and i pulled the power on the base station, but I still saw the same result. Any ideas?