Why do I need Dish 500 for the new AT150 subscription?
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Most of the new channels in the AT150 package are broadcast only from Echostar V, the new satellite at the 110W orbital slot. If you have an 18 inch Dish 300, you are probably aimed at the constellation of satellites at 119W (Echostar II, IV, and VI). There is little or no remaining capacity to add channels to this orbital location, all the transponders are in use for 8 to 11 channels already.
So almost all the new channels to be added will be added to a satellite that you can't "see" without a Dish 500. See:
What is Dish 500?.
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