If you dont have a blind for some reason the two tree method works to some extent get behind one to help conceal your draw and have the other behind you to break up your outline. I use decoys for two purposes one to bring in birds the other is to mark yardage. I will agree with the mouth diaphram calls its hard enough not to get busted making draw much less playing with a slate or box call. If you can aford it get a good blind. double bull seems to be about the best