No good luck with blindhunting deer.

I thought if I put one on top of covered high point (about 20') overlooking funnel and food plot I could get one, but deer activity stopped abruptly (could be other reasons of course).

If you are going to hunt a blind for deer, I agree with the others, at least put it out in advance b/c the deer are going to see it and be wary. I think the same thing is true of ladder stands in some respects. Also, you are probably dispersing scent in putting up a blind or ladder stand, so that's another reason to set them up ahead of time if possible.