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3 dishs on roof normal???

2 yes...fair amount of folks have 2 dishes on the roof. Can be the old mixed arc setup (110/119/61.5) or someone may have Dish and DIrectv dishes up there
3 not so much. I do though (2 KU dishes and Directv)
 
Eventually, when all HD is migrated to 72.7, you can drop 61.5 since your locals are not HD yet. And your already getting the SD stuff on 110 and 119