Hmm, well, maybe if I describe my situation it will help.
I have a computer in one room that my grandfather uses. I'd like to keep the modem in there, in case he needs to reset it, as he's there most of the time. The setup is in a triangle shape...like this....
A B
C
If the modem is a point A, where gramp's computer is, there's a garage between A and B preventing the signal from reaching B. Right now, there's a wired router at A with a wire running to a wireless router at C. This allows signal to B, but the internet is crawling at C, and I'm assuming it's because of this crazy setup.
I could maybe put the modem at C, along with a wireless router, and then put in a wireless card in A. I bought a card and put it in C. It cost me about $15, which was about $14.99 more than what the thing is actually worth.
It does make it look cooler with the little antenna sticking out, but, it doesn't make my space load any faster.