Increasing AP strength/laptop wifi strength

[Hitokiri Batohsai]

I have a toshiba mp50. The AP is a netgear Rangemax 4-port wifi. The problem is that the building has too many concrete sections, and there is only one area that has AP. Is there anything I can do to increase my laptop wifi or the AP signal. I prefer a low cost solution for the AP site, since its the company. I don't mind a mediocre solution for the Centrino laptop. Will a directional antenna a plate of aluminium foil work? Thanks

 

[BollWeevil]

You can replace the antenna with a directional antenna or a high gain antenna, but concrete is very difficult for 2.4 GHz to penetrate, so it may not be enough to help you out.