Hi Maddy
The problem is that the communial Dish is pointed at the Astra Sattelite from which Sky is broadcast. German TV is from other sats that are in a different positon and need a Sat dish pointing at them to recieve their programs. That is the main reason that there are private dishes springing up all over the urbanisation, people wish to view "non"Sky programs.
The best answer is to have what is called a stearable dish that will move to different sats so that other programs can be recieved. However to do this one would vae to have a southern facing place to install a dish, otherwise it is not possible
Hope this helps
Falklands