The first idea, is a building for the humans, a radar jammer, so that whenever aliens get anywhere near it, it disables the alien "radar". the distance should be the distance the aliens can reach plus half of that again. Should be available at s2 I think..

The next one, is a bit like the above one, except it is not a building. It is an upgrade, and it is stored in a backpack.(no using jetpack, battery pack, battlesuit with this baby) It makes it so that cannot be seen on enemy radar - the blue dot just doesn't appear. Does not affect grangers/adv. grangers(/dretch maybe)? Available at s2 and costs about 200-300ish? Maybe when the human gets harmed from acid, or any of those alien defence structures, the acid shorts it out for a couple of seconds?

Comments? Criticism? Pie?