Those useless AT guns...

[Steel God]

If you're playing K44 you'll probably not have much use for ATGs beyond what Dirk has suggested. However, in general terms ATGs are defensive not offensive weapons. They are successfully employed when you can get the enemy to advance upon them. These is best accomplished either by you determining the axis of advance your enemy will take, or you getting him to chase you and you luring him onto a line of them. But to be used effectively you want them concentrated and well situated.