Why does my signal strength waver?

Hi folks. Why does this happen?
http://www.pints.com/misc/wireless.png
I have 5 items in my house that use my base station. It is on my top floor, and I have one G5 3 floors down. I have a wireless webcam on the second floor, and a laptop and an Airport Express on the second floor. iPod right beside the base station on the top floor. I can't move the base station.
Why do my signals shift in power like that? Seems to be a base station thing, instead of other items all shifting at once.
Cheers!

Any wireless networks around you can cause intermittent interference. You signal may be find in one part of the house but not in the other.
Most modern routers provide their owner's with the ability to effectively "hide" their network so you won't even see it on a normal scan for networks. If you see 5 "visible" networks, you can probably assume that there are at least 2-3 more that you cannot "see". With only 11 channels available, you are already encountering crowded airspace.
My neighbor's cordless phone...across the street...can cause "blips" in my wireless if he's in the front yard talking on his phone. In general, cordless phones cause more problems for wireless networks than other wireless networks because most of them operate on the same 2.4 GHz range as wireless networks.
I had to get rid of mine because they were causing problems with the wireless network here no matter which channel I used. But, cordless phones won't show up on a scan for networks either, so you'll have to experiment to see if you can find a nice clear channel for your wireless.

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