How to Effectively Use Air Sweeper
Please start by reading the [Three Different Uses of an Air Sweeper] page first in order to understand better.
Air sweeper has only a 1/3 control over it's radius since that's how big it's Air Wave is, and since the fact that it can only lock onto one target, that would mean 2/3 it's radius is not in control or protect. What others are trying to teach you and use the Air Sweeper to protect something is mostly wrong due to the fact that Air Sweeper's actual capability is only 1/3 it's radius. In order to truly use Air Sweeper's radius to it's fullest, you need to control the remaining 2/3 of the radius and not have the enemies be the ones who dictate it, as well as the fact that you must anticipate that there is a possibly that the enemy will come in from the back side. Use the 3 Uses of Air Sweeper fully when it comes to the 2/3 side and it will guarantee success.
So to an Air Sweeper there 3 Elements:
1/3 Protection Zone
2/3 Unprotected Zone
Back side of the Air Sweeper
Protecting the Center is Incorrect
Any sort of centralized protection is wrong of you are only focusing on the 1/3 area. In these examples, I'm using Air Defense and Wizard Towers as an example since Air Defense attracts the attention the most, while Wizard Tower will represent the DPS.
Protecting 2 AD is Incorrect
Control the 2/3 Zone of the Radius
Protect 1/3, Deter and Stall the 2/3
Shield the Front, Protect the Back
Now that you know the 3 uses, and the 3 elements of the Air sweeper, you can now understand how it is utilized in an Anti-3 Star Bases.