i am looking to get rid of my 1.2 metre dish as it is sited at the back of my house & is missing alot of the eastern sats , the easiest solution is to put a new dish on my chimmney stack , my local installer has said that 1.2m is to big , any of you guys know whats the safest dish size to go for? would 1metre be too big? , any help much appreciated!