Why is the wi-fi signal meter on my Windows 7 laptop changing all of the time?

Why is the wi-fi signal meter on my Windows 7 laptop changing all of the time? The signal strength meter on my Windows 7 laptop keeps changing from two to four bars of strength and back again. It's starting to look like a peak meter from a 1980's stereo. The machine isn't being moved and it's plugged in for power.
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Guest [Entry]

Another possible source of problem is some other wireless device either near the router or the laptop interfering with the signal. I used to have a wireless phone sitting near my router and it took me weeks to figure out that it was interfering with the router's signals.