I am just moved house and am trying to set up freeview. I have a tv with built in Freeview receiver and there is an existing Skydish on the roof from the previous owner. When I hook it up I am not picking up anything though. I figured perhaps the dish is out of line but I know the previous people had Sky working ok. What is the best approach to troubleshoot this one. I do have a satellite finder if this helps but not entirely sure how to use it.

Thanks in advance.