go to atrpms.net and download the rpms that correspond to your wireless card
you should search under redhat enterprise linux 4 
(http://www.atrpms.net/dist/el4/)
i think the ipw2200 driver/kernel module should work nicely.
also don't forget to install the ieee80211-kmdl and the ipw2200-firmware.
to recap:
get the ipw2200 and ipw2200-kmdl from here: 
http://www.atrpms.net/dist/el4/ipw2200-testing
get the ieee80211-kmdl from here: http://www.atrpms.net/dist/el4/ieee80211/
get the ipw2200-firmware from here: 
http://www.atrpms.net/dist/common/ipw2200-firmware-testing/
worked for me on SL41 up-to SL43.

i hope this helps.

-- 
_____________________   _   _   _   _   ____________________
                     |_| |_| |_| |_| |_|
 Mitja Mihelic, System Administrator                Cosylab
 Email: [log in to unmask]    http://www.cosylab.com
 Phone:                                    Teslova ulica 30
 Yahoo! IM: mitja_mihelic                 SI-1000 Ljubljana
 Skype ID: mmihelic                                Slovenia
__   _   _   _   _   __________________   _   _   _   _   __
  |_| |_| |_| |_| |_|                  |_| |_| |_| |_| |_|