You can improve performance with this site:
http://www.freeantennas.com/projects/template2/index.html
I have used this for occasions to improve reception for customers that have their routers too far away or have interference affecting them. If you print off the windsurfer card onto card stock, and then glue tin foil on it, cut in the slots and tape it together, you would be surprised how much it will improve. Just remember to direct the parabolic antenna towards where you are. If you get stuck, you can view the systm video that shows it step by step on episode 45 at http://revision3.com/systm/surfer/.
Cool thing is they are basically free.
