I havent seen a dish but I could be wrong so wont argue. The owners made everybody remove their dishes for this communal one but since then a few immigrants have moved in and installed dishes so that they can watch TV in their home language.
We have a communal aerial covering both sky and terrestrial tv and our reception was ok but our neighbours asked us as they were getting the message that they had lost transmission due to aerial problems. This is usually down to the weather affecting reception.