Rattlesnake is a T2 cloakable pop-up long range plasma battery. Built by all T2 land/air cons it is able to protect your defense line from artillery units and dismantle enemy’s defense line. Out ranges all T1/T2 units except Pulsars and Basilica's etc. Build on hills to take advantage of extended range and take down strategic targets.
Set to High-Trajectory it deals more damage in a larger radius (AoE), but it will shoot slower.
Another use case is to stop Sharpshooters, which get outranged by these. Be sure to provide good line of sight for it, for good aiming.