At first run around and kill the people, buy a SMG to deal with the rounds.
Now when you have enough money go to the actual 'dome' part and go up the ladder on to the platform. Both buy a striker and a secondary weapon. Also buy one grenade launcher and a sentry gun. Now hide behind the corregated iron, this will protect you from other fire. Place your sentry, not immediately by the ladder but a few feet away from it, do the same with the grenade launcher but with the other ladder.
Between the rounds buy a spare sentry and grenade launcher. When it comes to choppers go inside the building under the dome bit and shoot-take cover-shoot-take cover. Have one person kill the other people coming towards you and the other shooting down the choppers.
When it comes to juggernauts, kill them with predator missiles.
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