Sky+ in a flat

[Resu]

Looking to get Sky +. I live in a small block of 4 flats and have access to the communal loft. The flats are around 30 years old and seem to only have one cable running from the loft to a single duplexer(?) plate in the living room providing freesat or freeview. Looking to throw in a shotgun coax and was wondering if it was as simple as just connecting it straight into this? There seems to be four feeds from the dish (four on left hand side, excluding top one) and one from aerial (top one on left).

 

[rapparee]

Are the outputs going out from the left to individual flats

 

[Resu]

The ones on the left hand side are the inputs

Edit: sorry reworded my explanation of the inputs as it was a bit confusing!