First of all, what version of Gentoo are you using?
How much experience do you have with Gentoo?
What exactly have you tried? What online guides?
Please be specific, as it is hard to know what you have done, unless you tell us.
It looks like lspci -v shows the card, so what have you tried to get the card up? Network Manager in Gnome? Command line setup of the card? Looks like you have a Prism based chipset card, so we know that.
Gentoo is one distro that I don't use, but I looked at the Gentoo wiki page
here, which gives a step by step how-to on wireless. I do have to admit that the documnentation is somewhat technical, so I can understand if you get confused.