Quote Originally Posted by dsayers View Post
I had installer out last year because trees in the next garden was interfering with the signal. He put the dish on my chimney.

No chance of me trying to re align it if I have issues in the future
Depending on the alignment of your house a dish can also be installed on the "wrong" side looking over the roof.

Code:
http://www.wrightsaerials.tv/reference/dish-screened-by-roof.pdf
With a lot of old properties the only thing keeping the chimneys standing is the aerial wires lashed around them