Nope, never been charged with trespassing. I *did* trespass once, but to be fair, I didn't really realize I had trespassed until after the fact, and I have refrained from doing it again. It was at my little spot just down the road from me where there's an eagle's nest. The first time I saw the eagles there, I went traipsing up the hill thinking I might get a better shot from the top. Well, first, I accidentally stumbled across where their nest was (I didn't even realize the nest was in the area at this time). I moved away from that area and eventually ended up on top of the hill. That's when I realized that it was private property and there WAS a fence. It had just been down at the point where I'd happened to decide to cross and I didn't even notice it. When I went back down the hill, I saw that a tree had fallen and taken out a fairly large section of the fence.
The problem is that the whole area is fenced off and I have YET to be able to get in touch with the owners and see if they'll let me go up there again. But in the meantime, I haven't gone up there since I realized it was private property.
If it were MY land, and I posted "No Trespassing" I'd want people to STAY. OFF. And so I try to reciprocate.
I also echo the statements by those who live in Texas, Kentucky and other areas. In Tennessee, ESPECIALLY in the hills of East TN, your best bet is to just ASSUME everyone has a gun. Not only would I not trespass on some property around here for fear of being shot at before being questioned, there have been times when I have NOT been trespassing and I was afraid I was going to get shot for being there.