What are the big (fabric) bubbles on satellite receiving stations for?

Are they on mainly spy dishes (so no-one knows what satalite they are directed at) or are they there to protect the dish from the elements. Both or is there some other reason

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Chosen Answer:

Well, …, they are there to protect the dishes from matter flying into them and obscuring the signal.
by: digquickly
on: 31st March 10