Where in the book are the rules for elevation granting you cover? or what do I search in the wiki? I can't seem to find them. Thanks
http://infinitythewiki.com/en/Prone "Prone troopers that are the target of a BS Attack declared by an enemy from a lower position than them will benefit from Partial Cover MODs against that attack."
p182 N3 rulebook (pdf or hardcopy). Prone troopers that are the target of a BS Attack declared by an enemy from a lower position than them will benefit from Partial Cover MODs against that attack. You have to be PRONE and Elevated, not just elevated (this presupposes that the level does not have a parapet or low wall).