Typically the best way to do this is to enable encryption on your wireless network. What kind of wireless router are you using? If you can get me the model number I can point you to the directions on how to do that.
I live out in the sticks and one of my neighbors keeps pilfering my gigs thru my wifi. I am pretty sure of who it is and would like to be able to 100% prove it, prosecute, and permanently block this crap. Any advice?