High Quality Content by WIKIPEDIA articles! USSS Electronic Countermeasures Suburban is an element of a United States presidential motorcade is the United States Secret Service Electronic Counter Measures Chevrolet Suburban. This vehicle usually trails the presidential limo and is used to counter guided attacks, such as IED's, Rocket Propelled Grenades, and Anti-Tank Guided Missiles. Its most identifying mark are two collinear antennas mounted on the roof that are solely used in barrage jamming applications, the primary method used to counter IED threats. The antennae configuration can be changed according to threat level, for instance taller antennas are used to increase the jamming protection distance, or change jamming frequency ranges. The vehicles were modified by Advanced Counter Measure Systems, Inc, a division of Sierra Nevada Corporation. The secondary distinguishing mark are two dome-shaped EW Sensors.

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