going by the direction the dish on chimney is pointing, either 1 of the positions would be good or a bit higher so no probs, i recognise the area mate and the reason why your dish was put on the chimney is because your house is a pre-fab cladded with 3 inch insulation boards and then skimned with roughcast ands a nightmare to get a good fixing, send me a pm if you want an ill pop down an have a look tomorow afternoon