This picture shows how not to increase the height of an aerial, and how not to affix the coaxial cable. The original mast appears not to have been long enough, so the installers have donned a ten gallon hat and somehow managed to clamp another 6ft mast on top using some kind of wall / chimney bracket. It's made worse by the long cable left swinging in the breeze and the fact that this aerial is a high gain one which means it's quite heavy and will be susceptible to quite high wind loads.