ATGs Air Rod Storm (ARS) The ATG master (Early Streamer Emission) range of terminals provides a safe and efficient system for the protection of your facility from direct lightning strikes. The ATG Air Rod Storm (ARS) terminal captures the lightning energy at a preferred point. How does the ATG Air Rod Storm (ARS) Terminal work? The ATG Air Rod Storm (ARS) air terminal uses the naturally occurring electrical field to complete the timely release of an upward streamer. This process provides for a safe and efficient method of controlling dangerous lightning energy at a preferred point. As a thunderstorm gathers overhead, the ambient electrical field surrounding the ATG Air Rod Storm (ARS) begins to rise in voltage. Upon the approach of a downward leader towards the protected area, there is a rapid increase in the electric field, which initiates the triggering of an upward streamer from the ATG Air Rod Storm (ARS) terminal. The early initiation allows for a larger or enhanced area of protection to be provided by the ATG Air Rod Storm (ARS) in comparison to a conventional rod.