How do you keep the satellite dishes off your roof?

[Scott F.]

How do you keep the satellite dishes off your roof?

My tenants aren’t allowed to have a satellite dish installed on the roof, however I keep seeing more and more of them popping up, what do you do to prevent this?

The dish installers simply climb up the ladder and bolt them in place without asking or getting anything in writing from the owner. 

No one ever asks - I'm guessing the installer doesn't earn any money if they don’t complete the installation, they need the roof to get a clear shot at the satellite - Uugh!