FC5 Broadcom 4306 wireless card setup
 

I'm still researching but I'm trying to setup my Broadcom 4306 wireless card. I'm using the 2.6.17-1.2187_FC5smp kernel and here is the output of the iwconfig command:
# iwconfig
lo no wireless extensions.

Warning: Driver for device dev21605 has been compiled with version 20
of Wireless Extension, while this program supports up to version 19.
Some things may be broken...

dev21605 IEEE 802.11b/g ESSID:off/any Nickname:"Broadcom 4306"
Mode:Managed Access Point: Invalid Bit Rate=1 Mb/s
RTS thr:off Fragment thr:off
Encryption key:off
Link Quality:0 Signal level:0 Noise level:0
Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0
Tx excessive retries:0 Invalid misc:0 Missed beacon:0

eth0 no wireless extensions.

sit0 no wireless extensions.

I'm not sure what to do from here.

Please note that the Wireless Tools (starting with version 19) supports fully IEEE 802.11 parameters and devices, support older style of devices and most proprietary protocols, and are prepared to handle HiperLan as well. More recent versions of course adds more 802.11 support.
But, unfortunately not all drivers support all these features...
The Wireless Extensions and Wireless Tools version numbers will not match with each other. The Wireless Tools and the Wireless Extensions (the underlying API) evolve independantly of each other. The command iwconfig --version gives you the detail of your setup.
Compilation of the Wireless Tools used to be tricky, especially in the header area. I believe this has been fixed for good.
For kernels before 2.2.14/2.3.30, use Wireless Tools version 19.
For kernel after 2.2.14/2.3.30 use Wireless Tools version 20 or greater.
For kernel after 2.6.13 use Wireless Tools version 27 or greater
In the old time, you could upgrade Wireless Extensions by just changing wireless.h. Starting with Wireless Extensions v12, this is no longer true, you need to apply the full patch to the kernel.

For e.g. this is my output