My neighbor has wi-fi access and we like to play Starcraft / Quake against each other. Sometimes the signal isn't the greatest and I lag. Can I buy an antenna to increase the signal? I'm not quite sure how they work...do they plug into the computer or just the wall? Thanks. I have a mac pro with Airport Extreme card. He has Windoze PC with WRT54g router or something like that... Any suggestions on a good antenna? Thanks.