I had some wireless dead zones in my home so I bought a Wireless Repeater (they're so cheap!).
Unfortunately, the location for the Repeater was such that it would confuse my laptop's wireless card. The location was just about the same distance and strength from the base Access Point.
I resolved the issue by taking a piece of aluminum foil and creating a barrier so the signal from the omni antenna wouldn't be sent toward my laptop. Easy! And with infinite adjustments! :)