I have a linksys wireless PCI network card for a computer. This computer is in the basement of a corner of the house, while the wireless router is almost to the opposite corner of the main level.

Obviously, the signal right now is very weak. Occationally it gets disconnected because the signal is so weak. I know I can buy a wireless signal extender or something, but I'm kind of a fruggle guy. Anyway, I've tried moving the computer further in along a wall and the signal improves.

The linksys wireless card for the computer has a fixed short antenna that sticks out. I was wondering if it is possible to somehow add an extension or replace this antenna with a longer antenna?