A communal aerial or Sky systems is usually the responsibility of the management company but sometimes they may have had a SKYQ system installed by Sky and if it is under 12 months old or not a part that was authorized by the management then that would lie with you or Sky depending on who fitted it.  So if you do live in a multi-dwelling property such as a block of flats or apartments it is possible you all are using the same aerial to receive TV and satellite signals; this is known as a communal aerial system and sometimes the expression used is an IRS system. It’s usually the landlord or management committee’s responsibility to deal with any faults with a communal aerial and satellite system.