Sensitive operations areas need accurate, efficient, and effective tools to monitor any suspicious transmissions from specified sub-areas. These specific areas to be monitored can be as small as an individual room in a building. A fundamental change in RF detection and monitoring efficiency is needed for the modem organization to achieve and maintain this level of precision for electronic security in its area of operations. It is an object of the present invention to provide just such a method to automatically detect communications signals in near real time, from any selectable sub-area of a compound. Such a system would greatly enhance the operational capabilities of the twenty-first century organization by providing a real-time capability to secure radio communications in and around a compound. The system should have real time direction-finding methods, such as those espoused by the invention of application Ser. No. 10/912,976. The system has all the abilities of the system described in the '976 application, but is further able to automatically detect the direction of the incoming signals (relative to two or more collector subsystems in communication with each other), and thereafter to add that information to the surveillance decision logic such that the actual geographical location, as adjusted by the calibration information for the particular compound surveillance decision logic. The system automatically detects communications signals in near real time, from any selectable sub-area of a compound. The system employs the real time direction-finding methods of the system disclosed in application Ser. No. 10/912,976, by the same inventor. The system has all the abilities of the system described in the '976 application, but is further able to automatically detect the direction of the incoming signals (relative to two or more collector subsystems in communication with each other), and thereafter to add that information to the surveillance decision logic such that the actual geographical location, as adjusted by the calibration information for the particular compound surveillance decision logic. Secondly, the system has the capability of being calibrated such that the particular RF environment of the compound in question is uniquely mapped. The calibration tables maintained by each network-attached directional collection node of the system invention in order to provide a more robust and accurate signal geolocation system. Thirdly, the system is able to automatically pinpoint the geographic area of the source of the incoming signals and add that information to the monitoring decision logic. Finally, the system provides a user interface to operators so they can easily select areas to monitor, and easily calibrate the system for maximum precision.