If the signs say NO TRESPASSING, you bet charges can be filed. You know, the best thing to do is just ask the owner. Personally, if folks would ask and we could show them where was safe to shoot, I'd be fine with it. The same goes for exploring...ask permission first.
An update for us: Some fencing was put up, more signs are up, DH is staying home tomorrow and all cameras are ready to go. We'll probably get some hunters this year but this year we'll press charges. Also, for next year, because there are so few of us on this hilltop, especially on our road, we are going to talk to the other owners and it is highly likely that both ends of this road will have large signs saying POSTED! HUNTING PERMITTED WITH WRITTEN PERMISSION OF LAND OWNERS ONLY. We are sure that both neighbors will be agreeable, it's just a matter of a few phone calls. Also, we have seen notices in the local papers about NO HUNTING ON ANY PROPERTIES OWNED BY JOHN DOE. We will do the same, except with all neighbors names and the name of the road and township.
DH found a newly erected tree stand about 15 feet from our line at the bottom of the hill....only way they CAN shoot and see anything is into our field...we left 4 signs there and some new fencing. The same folks (we watched them yesterday) were running their ATV's through our field....new fencing there, logs now in the way and signs posted there as well.