The Mobile Radar Jammer defends nearby units against many missiles. Any guided missile is affected. This includes the missiles of: MiGs, submarines, mammoth tanks, chrono tanks, Longbows, etc. If it's homing - it's affected.
The Mobile Radar Jammer can jam an enemy's radar dome by getting sufficiently close. This will hide the enemy's minimap, as if the dome is powered down. When a players radar dome gets jammed, a powered down sound is played.
The unit has 2 circles around it indicating the effect radiuses. The smaller red one is the radius where missiles are deflected, the larger blue shows the radius for jamming the radar dome.