I assume you have permission from the owner first? :-)
I'll assume you do... The Pringles can antennas do work very nicely -
they have an effective gain of 14-18dB. OTOH, they're Pringles cans -
i.e., mylar- or aluminum-coated cardboard. If you want something a bit
more substantial, check out
http://www.cantenna.com. For $20 bucks, it's
a better bargain than growing your own...
Check out
http://www.wi-fiplanet.com/columns/article.php/1008901
Follow the links there and you'll be up to speed in no time.
Scott Hill wrote:
I live just over 300m away from a house i need to make WiFi comms. with. It
is almost LOS but there are a few trees in the way. Ive been looking at a
few directional antennas on the net, but most are made from bean cans and
pringle tins. On principle, the bean cans look like they should work, but
could anyone please make any suggestions as to their credibility or
liklehood of working!
Any other (affordable!) means to make the comms. using an off the shelf
802.11 card?
thanks!
scott 
--
Jon Gauthier
Given the likely reaction to an increase in
terror-alert level to "severe threat imminent,"
wouldn't a more appropriate alert color be brown?
-Brad Simanek on
www.ruminate.com