Here's a quick tip... If you are having trouble with your Xbox360 wireless adapter getting a good signal, you can extend the adapter with a regular 'ol USB cable. I used a 6 foot USB extension cable and extended my Xbox360 wireless adapter a few feet closer to my wireless router. The signal improved dramatically.

Now I do not have a bad network connection as an excuse for my many horrible online deaths in COD4 and Halo 3.