Airport Problem

Hi,

I connect to the internet using Airport, and recently, my wireless network has been very tempermental. Sometimes the internet will be running at it's full speed, and at other times I will get little or no signal strength.

Also, when I run the Activity Monitor, and check under the Network tab, I am being told that I am sending out a number of packets, but I am recieving a substantially larger number of packets than I send out.

Any idea what might be causing these problems?

Thanks.