Abstract: A personal security system and process for use thereof wherein customers of a security service are provided with personal transmitters capable of selectively transmitting one or more radio signals at a desired frequency, the signals representing the particular character of service that is desired. A number of antenna/transmitters are located in evenly spaced relation in the geographical area and correspond to a computer grid work of the geographical area. The antenna/transmitters receive signals having X and Y axes from the personal transmitters, amplify the signals and transmit them to signal processing equipment. The signal processing equipment includes an automatic direction finding circuit capable of receiving the X and Y axes components of the personal transmitter signal and the vertical elevation of the signal in order to yield an ADF signal output reflecting the location of the signal.