Hi. My mother currently had MySky at her house - there are 2 rg6 cables from the dish going into the back of the MySky decoder. She is about to move in to a new house. The new house has a Sky dish with a single rg6 cable from the dish to the lounge.

Will she need to get Sky/an aerial installer to do anything to the new house dish wiring, or will it work without any fiddling around? If it will work, what is the point of the current 2 rg6 cables? 

Apologies if this is covered elsewhere - I did a search and looked through the results but I read differing info in different threads. Thanks.