Fedora 16 wireless connection

[Roger]

Have just installed Fedora 16 on Dell 1645 laptop, all went very well.
I have a problem with the wireless connection to my Gateway TG792T 
wireless modem
Network Connections shows "Wireless firmware missing"

Can you please tell me what is missing and where to find it.
There are many pages in Google, none has helped with clear explanations.
Fedoraproject.org/wiki/Firmware shows available firmware and Tools but 
nothing to say what is needed.

Thanks in advance
Roger