Any way to extend range of internal wireless PCI card in PC?

I assume things like a Hawking antennas are normally placed on a router.

Can they be connected to a remote Desktop PC as well? Example: One on the wireless router and one on the wireless (remote - another part of house) PC to gain maximum ability to pick up a signal? Or does it just need to be on the router?

Are there any products without changing to USB (where you can put unit on top of a table or move it around a little) to provide a better signal off the PC Wireless PCI Card antenna (back of PC)? Perhaps take that antenna off of PC and attach a cable that can extend

Thanks, Patty