The picture looks just fine to me.
We're too treed and too high a latitude for satellite to be a good option, but I see no image problem with cable. Broadcast isn't even an option. I remember when I was a kid, 10 channels of ants and 3 channels that sometimes showed up well enough if you said your prayers and banged on it in just the right spot. :~D
If your cable company can see the satellites, you would too. Satellite footprints go as far north as Canada and as far south as Mexico. You just have too many trees on the south side of your yard I guess.
Then forget I said anything. The artifacts are there, but if you're not seeing them, be grateful. Seriously - I'm not flaming or disparaging you. Be grateful.
See my #59 and #61. I can hardly stand the lousy pix I see on Dish sometimes (I have the same opinion of DirecTV and digital cable.)