Build a second base and set one of the ships as a rally point for your units. Be sure to make Warthogs with a gun that can shoot down units. Build turrets at that base so you don’t need to keep units around to protect it. That will be your reserve ship and it will stay protected. Now with your original base and your other units try to protect the other based. I had about 15 Warthogs in front of my reserve ship. The shit worked for me.
