Many people living in apartment blocks will have access to a communal system which should provide access to TV and satellite signals.
Many systems, however, have not been upgraded for digital Freeview or for Sky+, although you can usually still get analogue TV and normal Sky.
If you cannot get digital Freeview or Sky+ then you should contact your letting agent or estate management company about rectifying this.
Cable Guys will do a free survey of your property to assess what is required to upgrade your system.