I seen one on a 2 storey building once, it was a Co-operative store. Hutchinson antenna. Theres not just the antenna, though, theres all the grey boxes they have to install too. In this case, the antenna was mounted to the brickwork, on standoff brackets, and stood with its top just below the apex of the roof. This was the back of the store, so it wasnt visible from the front. Nobody knows it is thereAt first floor level is a flat roof, and all the equipment is mounted there. Only an SWA cable goes down to the ground, with a box (presumably electric meter) near ground level.
You'd be surprised where they are hidden!! I have been building sites for about 7 years now and still amazes me that they get away with it.
