Wireless Help?

[Jeremy J Swarm]

I can't seem to get my wireless card to connect to networks that i know
exist. i've installed network-manager and network-manager-gnome, but it
still seems to have issues. it seems to know that i have a card, and it
pretends to know how to use it, but features which are available to the
same hardware under other operating systems are, unfortunately,
unavailable to me under ubuntu. I really, really want this to work. Any
help?
btw, it's a Belking 802.11g Wireless Desktop Network Card (F5D70000)