Tell your HOA to read this page:
FCC Fact Sheet on Placement of Antennas
and then get whichever provider YOU want.
They can't do that, in other words.
I am not protected by the OTARD rules in my situation. It states that I can put up a dish in an area that I have exclusive use of like a deck or patio, as long as the dish is entirely in my owned area. I don't have such an area. I have a railing 2 inches outside my sliding door, where if I mounted a dish on the railing it would hang over common property. The HOA has an agreement with an area Dish installer, and so they only allow for Dish installs on their rooftops.
I've talked to my lawyer and after reading the documents he agrees that I'm SOL on this one.