Being behind a tree doesn't necessarly mean you are protected..
The other night I was defending a base. I was parked next to a hanger looking out via the top turret gun. With the graphics turned full down. I could see an inbound tank in the distance. I jumped to the main gun and all I could see was tree, it was just a few feet away from me. It appears because I far enough away from the tree to see through it when unzoomed in, but close enough that when zoomed in, it was all I could see. He was far away from the tree, so he couldn't see it.
My guess is, the rounds were passing under the foliage, next to the trunk and hitting me. Since I couldn't see him, I couldn't return fire.
How frustrating is it to be able to see a con from the turret, but not when in the main gun.
That trip back to the tower hurt. I had driven for a long time to get to that base, as the VH was down and I upped from a near by spawn. Arrgh!!!
Sometimes you're the windshield, sometimes you're the bug....