On forge world area (the Cage) look for a hidden area in the hills/mountains then build a base.

The best weapon is a sniper and a rocket launcher, so you can snipe and destroy any aircrafts. Also build a bridge to the island so you can jump down (but can't jump back up without a jetpack).

This is how you never die.

PS build a shield too so no aircraft can come in without landing on the bridge.