[CentOS] CentOS 5.3 - Activating laptop wireless card

I've just installed CentOS 5.3 on my Dell laptop and it seems to have
detected and set-up my wireless card (BCM 4311) correctly as eth1.
However, so far I haven't been able to activate it and have read the
wiki
http://wiki.centos.org/HowTos/Laptops/Wireless#head-320d6fcf09b7e16e0b15d19ef76adcb023a95938
which indicates that this card isn't actually supported in CentOS - but
there has been an improvement over earlier kernels because the card
wasn't even detected in CentOS 5.0. So do I need to get the Windows
driver from http://www.broadcom.com/support/802.11/linux_sta.php and do
I need ndiswrapper as well?

Andy