That is where it draws the line. He installed a dish on your metal roof, your property. Of course they would need your permission, that was silly of them. If they installed it like say on a tripod on their porche if they had one without damaging your property then he may have had a case. May have had
Its not even so much that they needed a tripod, All they would have had to do was ask me , and I would have let them mount it in a location that we all could live with. Not my $30,000 metal roof.
The only reason I commented was just to make sure people understand that the landlord can prevent you from installing a dish when it comes to destruction or alteration of property.
Tripod away, just don't bolt it down to my deck.