So I was going to hook each wan to a wireless bridge. Does anyone suggest a specific device? It must have removable antennas because most likely I will have to use a cantenna, yagi or parabolic antenna (http://w3bguru.com/wiffy-extreme/) to reach my buddies house.
I have never used a wireless bridge. Is it as simple as just clicking find wireless signals and connect to one? Can I use something like netstumbler? I've heard you can flash linux distros on the WRT54GS which you can configure as a bridge?
I can suggest a solution that I am pretty sure will work (since Linux based and pretty customizable) but I have not tried it. And along with this, my advice is to try this at your LAST resort since it will take a **** load of time to complete.
Software: Google for HostAP, currently at http://hostap.epitest.fi/
Wireless AP board: Soekris Engineering net4521 or net4511 (embedded board)
WiFi Card (to be inserted in Soekris board): Senao/Engenius NL-2511CD Plus Ext2
External Antennas: whatever you like, google for i.e Ubiquiti Antenna
The WiFi card has 2 jacks for external antennas. There are tutorials on the web on building this setup. Like I said, try it as your last resort or you have high energy to learn things.