u say your 40ft. up and you say they can see you?? i say bull, one of my dads friends was huntin about 30 or 35 ft. up and there was a doe that came in on him and looked right up at him, then busted, just bad luck, maybe, but just cause your that high dont mean they can see you, especially if you hunt the same spot. i sorta had that problem this year, my stand is only about 10ft off the ground, but anyways i had this doe come in on my about 30min till dark and she come in on the other side of the field and she would always look over towards me, so she new something was up, but that was only cause i spooked her, she never came back over unless i wasnt on stand and was sittin somewheres else, just my .10