If you have a direct line of sight to the wireless access point, you just may need a better antenna. You first would need to use a wireless card that allows you to connect an external antenna. Most built-in cards, and many USB/PCMCIA cards don't have this capability.
You then need a directional antenna. This is often referred to as a "cantenna", because many of the original designs were made from a Pringle's Potato Chip can. Here is one such device: PringlesCantenna - SeattleWireless AntennaHowTo - SeattleWireless Antenna on the Cheap (er, Chip)
There may be a different antenna that you could put on the access point end. I don't know about this, but the source of my first link, Seattle Wireless may have info on that.
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Paul
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