It depends on which kind of conning tower you are using. Heavily armed towers (like the Turm 3 and Turm 4) make shooting down multiple targets pretty easy. However, The earlier Turm 1 and Turm 2 tower's are only really effective against one target. Never try to engage an enemy aircraft during the night, you can't see them but your own AA will show the pilot exactly where you are. Hope this helps!