But that's not a router, and it's important to keep your terms straight if you want effective support.

A wireless router is a wireless device that primarily transmits a signal, and wireless cards are primarily receivers. Wireless cards/receivers tend to come in three main types. Either as a PCI card that plugs into the inside of the computer, a USB attached device, or what's known as a wireless ethernet bridge which essentially turns any ethernet port into a wireless device.

Almost universally, USB attached wireless devices are horrible. PCI cards tend to be the best, but they don't have the same range as an ethernet bridge. Since those connect via an ethernet cable, you can theoretically have the wireless receiver at the end of a very long ethernet cable if you have signal issues. Kind of defeats the purpose of wireless to have more than a few feet of cable, but it's possible.