My apartment complex only required a deposit if you mounted the dish to your balcony and had to drill holes for the cables. So some people were, for a while, buying a bucket, filling it with concrete, then sticking a 5 foot pipe into the cement. The dish was attached to this "stand." They also ran their cables through a window so there are no holes. In this case, they didn't have to pay the depoist.
Well, the four hurricanes that hit Florida last year caused the management to change their mind. A couple dishes ended up going though windows and railings, damaging parked cars, crashing in to A/C units and damaging the fountain heads. The sent a lease addendum to everyone that requires a deposit for ALL dishes. Anyone who didn't sign the addendum was given a 60 day notice.
And before you ask about anything else being left on the balconies, the leases already state that nothing may be left on the balconies while not in use, with the exception of bicycles chained to the railing.
Good luck!