Maybe some utility in a broadcast device of some sort that puts out a “cloud” of white noise in the wifi bandwidth. It’ll stick out like a sore thumb that the detection is being tampered with, and will probably disrupt wifi in an area, but providing too much data for the system is probably a better call than trying to hide yourself from it.

There’s just no feasible way right now to stop the way that radio waves interact with your body, other than not being in that location.