I've recently dis-enabled my own Wifi so I don't have to worry about my own wifi being used by others outside the house against me. (My concern is not people using my wifi because they don't have their own.) But I am wondering if nearby houses with wifi which overlaps my own could use their wifi to somehow see what I see on my computer monitor.
What I'd like to do if it is possible is to somehow make my computer or my router completely unable to process wifi regardless of where it comes from. If possible, this would seem an un-passable and simple barrier to outsiders who use wifi to gain access to others computers.