Anything that might detract from the ability to sell your home, even slightly, will reduce the property value on the next sale, unless you are in very, very strong sellers market.
There are some people who think small dishes are ugly and look bad in the front yard or if in a highly visible location. By eliminating them from the pool of people who would buy a house, the property value suffers some. At least when one looks at the overall effect upon lots of homes. Every sale has its own situations.
But there are others who would find having a dish already installed to increase the value
With something so small and trivial as a dish, I don't see it really hurting or helping the real value, unless its in a really conspicuous place, do you?
If I where the OP, Id send the letter to the board the day before my appointment was set up, and I would put it in the least conspicuous place, just because that is logical, and then I would consider painting it if it made sense.
By the way, make sure you look into what paint would be best for this situation. Not all paints would be good to use.