Did you make that hole?My Buffalo antenna (70 feet away from the Toronto one) points at a hole in a large maple tree in my neighbour's yard.
There is an antenna tilt thread but it don't really get that specific about the line of tree's senario.
This website page I noted seems pretty specific though - point your UHF antenna at the visible horizon. In my case this would be the tops of the trees some 50 yards away.
Still curious what the resident experts have to say about this.