Are you running modprobe as root?

Yes I am!

Any idea whats wrong?

Granted wifi in Linux is mildly complicated, but the solution is not for you to wait around for someone to tell you what to do. There are lots of Fedora books and documentation around that you should be studying. I don't remember a whole lot about Fedora although I used it for quite a while 5 or 6 years ago.

Find out from somewhere about modprobe on Fedora; and check the output of $ uname -r. If your kernel is at least 2.6.18, this thing should work. If it's not, you need to find out if 2.6.18 is available for Fedora6. I would have to assume that it is.

Can you point me in the direction of this documentation or should i just start at google?

I suspect the modprobe problem may be due to Fedora's slightly mangled PATH. As a fellow fedora user, I sypathize. I think /usr/sbin is not in root's path, so you have to type

/usr/sbin/modprobe (the name of the module)