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I had this problem in my house and after a lot of experimenting was able to track it down to the cable running into the house was running too close to the electrical. The cable was wire-tied to the main electrical feed for the house on the outside, and running over the top of the electrical box in the basement. After replacing the feed into the house with RG-6U, drilling a new hole into the house, and running the cable a few feet from the electrical, the problem went away. My advice for troubleshooting, try attaching a single TV to the cable feed on the outside of the house first. I did that by simply running some RG-6U out the door on the ground and connected it directly to the feed from the pole and to a TV. If the horizontal bar (hum bar) goes away, the problem is most likely caused by a cable wire somewhere running too close to electricity. (Thanks for fmook for this one.) Editor's Note: That horizontal bar is called a "hum bar". Feedback received on this FAQ entry:
![]() by Raydr |