thanks for your replyyou could swing by and ask the management if there is a central satellite for the building in which case you can subscribe to OSN's service directly.
if not, you will not have a choice as to the provider, it will be du or etisalat and it will be fixed to one.
almost all buildings will have rules against mounting your own satellite dish on the balcony.
maintenance people told me that the sat connection is active and working. I still didn't try with a receiver for free to air channels, but i will in "near" future.
If you will try before, please let me know!