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Nobody comes out. They send you a box for the receiver and remotes, and they ask that you remove and return the lnb that's mounted at the end of the dish. IF you feel it would be dangerous to go up there and remove the lnb (it comes out after unscrewing a Phillips screw), tell them that, and they'll wave you having to return that. The dish and such remains up there, unless you take it down. IF you do that, I highly recommend you leave the "foot", so your roof doesn't leak. Or, remove it and use roofing tar to seal where it was.
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Great; I found a link on how to use the dish to mount my antenna on it. So I'll keep it up there and use it for that.