this one?
https://www.netgear.com/support/product/WG311v3
yes, that is a pci card, you need to use the lower pci port on your mainboard as described previously
this card is a one antenna only, so if you haven't added a external bigger antenna consider changing that small antenna for a bigger one
on a desktop pc a wifi card is the less desirable part to have, wifi signal strength, weirdness on ping and connectivity issues makes a ethernet adapter and a good cat 6 cable alot more desirable, only useful when you don't want cables and don't play online games