I was using this device w/ a single tv, & it caused poor picture quality,w/ no boost to signal--I talked to an electrical tech at the company & he said that it is only effective w/4 or more tv's--when I asked why this wasn't specified, he said that he didn't know(chuckling)--it might work great on 4+ tv's?
I bought this as a gift for my mother as she was having problems with digital broadcast channels going in and out using her extended range antenna. I plug this unit and she went from 32 channels to 46 channels without touching the antenna. It also helped receive a stronger signal so channels would not black out. Very impressed. I am thinking of purchasing another one.
I had 2 missing major local channels that now come in clear, and I got the same result on a second TV in a different room after I bought an additional one. This was no accident... I searched the reviews before I bought this product.