I grounded my slim line dish 5nlb to the multi switch, then ran the copper wire to the ground Comcast had installed. I don't think most of my house is grounded, (except the meter) because it's 45 years old and has mostly two prong plugs. I think the kitchen and plug for the HR20 may be grounded to the water pipe. (something is grounded there) Anyway, I do have a multi meter with resistance function. Can I check to see if the dish is grounded?