computer help

[speed]

Hey guys so here's my problem i have a laptop for high school buts its on the second floor and my router is on the second and the connection is horrible. I also have a 360 so playing online is a hassle. I've heard about a signal booster but have no idea what it does, how it works or what i need to get. So if any of you computer geniuses can help that would be great. Thanxs in advance