really bad lag in wow?

for some reason, lately i've been getting REALLY bad lag in WoW, but it's only at my mom's house
i use a wireless internet adapter, but it worked perfectly fine a few weeks ago..... i've tried resetting my routers/modem but nothing seems to fix the problem
should i just give up on the wireless and go wired? i really love being able to play wow in my room and not having to go to my basement.... (i can't setup a new router because i don't have any money for one and i have no knowledge of how to set one up

Wireless has a long inherent latency. As I remember it you can generally expect 20 ms or so extra latency on top of what you would get with a wire. If possible I'd definitely try using a wire to see if it fixes the problem.

You might also want to see if this helps:
Reducing latency

If you are running 5 copies of WoW on your machine the extra 20 ms delay from wireless would be multipled by 5 (potentially, ymmv).

Someone might be on the same channel as you or close to it bleeding over. Download netstumbler and see what chans are open. Change your router to an open chan.

http://netstumbler.com/