How can you detect someone steal your Wi-Fi internet?

United States
September 21, 2010 3:39pm CST
Probably majority of us might have more than one computer at home, and we would like to install a router to connect all the computers to be ready to surf the internet. Most Routers you purchase from the store might have Wi -Fi connection capability, so, if you don't lock your router with a password, you neighbors might steal your connection without your notice. Even though you lock your password, some hackers can hack into the Wi-Fi router, and still have your connection. I just wonder is there anyway you can detect whether someone is stealing your internet connection?