I built an almost identical system this past year as my EE capstone project. The accuracy of these systems is limited by environmental factors (large metal stru

I built an almost identical system this past year as my EE capstone project. The accuracy of these systems is limited by environmental factors (large metal structural/aesthetic features of a building) which can be corrected to a certain extent, but it would still be trivial to avoid being tracked by using a directional antenna.