I use a wireless router and card for my laptop around my house. I want to go wireless at my office to get broadband to 6 PC computers. I'm curious on the equipment I need. Obviously I need a wireless router, but do I just need a wireless PCI card for the PC's? I've seen those PCI cards with an antenna sticking out of the back. If I swap out my ethernet card on a PC with one of those, is that all I need to get broadband to all the computers in the office?