There is no need to spend hundreds of dollars to achieve high signal strengths - although this is what most people do spend on wireless bridges or special signal amliphiers. It is better to simply use an efficient antenna designed to focus the signal into a tight beam.
Another advantage of this approach is that it makes in harder for a WiFi hacker (some one who want to piggy-back onto your WiFi set up to access the internet using your network) to uncover your signal if it is tightly beamed to a selected destination.
There are hundreds of different antenna designs available - some good, some not and trying to find the right one can be a very tedious undertaking. Some are easy to install and some are very difficult.
The following designs - while not professional by any means are cheap and very effective solutions.
Please do not disregard these because they appear to be amateurish - they are NOT! They are very well developed solutions to a very common problem and mimic the commercial, expensive solutions.
If you have access to an old Conifer antenna (check e-bay) then Martin Pot's web page will help you fix it right. (http://martybugs.net/wireless/conifermods.cgi) These changes will give you, for about $20 and 3 hours work, a 18-24dBi parabolic grid antenna.
Another alternative is at (http://www.mrx.com.au/wireless/conifermodifications.htm)
Then there are the Pringles container modifications. These will only be good for 12dBi but if it is remembered that the antenna on a built in wireless card is only 3dBi and most of the small whip-aerials are 6dBi then the Pringles solution is a 2 to 8 times boost in signal strength.
Go to http://www.seattlewireless.net/index.cgi/PringlesCantenna
and for a cake dish antenna http://www.saunalahti.fi/~elepal/antenna1.html
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