Unless we are talking about a different "wifi radar" here, it doesn't need you to have wifi on your person to track you, the radio waves being emitted by the wifi device (like a router) are being tracked and they can tell where you are and where you are going based on the interference your meat creates. If they have a "wifi radar" on every street light in your city, they could just literally "watch" you from the moment you leave your house. You could be completely tech naked and wearing a full body suit and a mask, but at some point you still had to leave your house, and chances are they can figure out who lives at that address.