In message , Windmill
wrote
From the street I can see a few cases where a TV mast has been strapped
to a chimney (the approved method AIUI) but, despite the metal corner
brackets between the strap cable and the chimney, the render has been
cracked at the chimney corners and has separated from the underlying
brick.

Is there any way to make this less likely, given that a cable would
probably need to be under a fair amount of tension to hold a satellite
dish firmly in place?


Why do you want to fit a dish to a chimney? It's more suited to being
fitted to a wall.

If you cannot fit it to the satellite facing side of a house
http://www.wrightsaerials.tv/reference/dish-screened-by-roof.pdf

--
Alan
news2009 {at} admac {dot} myzen {dot} co {dot} uk