Good supported wireless desktop adapter

[brad]

I just moved from a house that was wired with cat 5 to a house that is
not so I am needing a couple of wireless adapters for my desktops.  I
have not played with any of these in Linux so I was wondering if anyone
has any suggestions for a well supported adapter?  I am running various
Fedora flavors.  I need 802.11G and probably an external antenna since
the firewall and AP are in the basement and the desktops are on the 2nd
floor.  The cheaper the better as well.

TIA,

Brad