I don't think anyone can accurately explain how dma's are determinined as they were first set back in the 1950's. The FCC mapped out the US with dma's given an area around them with many of them a lot bigger than others with a lot of small one's missing many network offerings. Your receiving channels or not being able to receive them have nothing to do with what you are allowed to have. In my case, I am in the NY dma even though the center of the NY dma is almost two hours drive from me while the neighboring dma is only about 20 miles. My sister who is maybe 1/4 mile from me is in the neighboring dma. Dish not offering you locals does not get you the nearest dma. Dish has another company in place you can offer you distant networks if you cannot receive yours, Atlanta happens to one of them (SF is the other) so that is probably why you would get them.