I've got a D-Link G520 that I bought on a recommendation. I'm using the open source mad-wifi drivers that perform quite well. When I was trying out FC, I had to download the drivers seperately, but they're in a fairly popular repository. I don't recall having that problem with Ubuntu though, so it's possible that FC4 has included them. The antenna is detachable, and currently it works from my basement to our upper floor. Its entirely possible that you might not actually need a new antenna, unless you're planning on using that shitty 2wire router that SBC provides.
Justin Dugger
I ended up going with a D-Link DWL-G510. I have it working under ndiswrapper and it seems to be fine. It is syncing fine with the LinkSys AP in the basement. Guess I will get another one of these cards fro my other desktop. Thanks for the suggestion.
Brad