The comment before this might be of use to you.
As for Berlin - well, I tried a 120cm dish and managed to receive a blocky Childrens ITV for about 10 minutes. I only did it for the sake of the BBC channels
So I deemed the whole exercise pointless. Needless to say, I have since moved and have better access to the roof. When, and if, I stumble upon a gazillion euros for a stand - I might give it another go. Meanwhile, CHA4 and Five satisfy my desires - Channel 5 literally.
A 240cm dish is the optimal size for this neck of the woods.
Regards,
Mark.