Hi Green
Yes, Linksys are good stuff I heard.
But even cheaper (I guess) is D-Link, and they have external antenna connectors to.
The only thing with the D-Link gear, is that most of their FW (FirmWare) releases are NOT good!
If you are going D-Link you can use the DWL2100AP, wich is good, and even has SNMP and a Telnet server.
The older ones only have a web server for configuration.
I have tested and used most of them, but the 2100 is the most stable and competent one.
I also have built and tested many antennas, including Yagi's and the "cantenna" (Pringle's can) , anf they'll all work just fine
But if you wish to transmit the signal VERY far, you can use a old parabolic dish and a standard "patch" antenna (8-10dBi) as feed
One thing to remember though, if you are going to use external antennas, is that the "hidden station" phen. is likely to occur (that is when 2 given clients cannot "see" eachother, thereby colliding). This only occur in "AP" mode, and not in "bridged" or other PtP modes.
Here you can
calculate your signals if you wish
/Sonny