A radio presence-advertising
signal (PAS) a PAS emitter is simultaneously received at two or more co-located directional antennas that are coupled to respective radio receivers. The antennas have reception sensitivity lobes that overlap to define a
region of interest at the overlap. Substantially cotemporaneous
signal strength indications are obtained from the radio receivers. A difference
signal representative of a difference between two of the obtained
signal strength indications of the respective antennas is generated. An average signal representative of a running average of two or more of the obtained
signal strength indications is generated and used to produce a normalized confidence indicator indicating a level of confidence that the PAS emitter is disposed inside (e.g., centered in) the
region of interest or alternatively indicating a level of confidence that the PAS emitter is disposed outside the
region of interest. Action is taken or avoided based on the confidence signal.