I was getting a 17 signal strength from abc in denver with rabbitears, so i went to radioshack and bought a outdoor ant and now I get a signal stgth of 79 but it still will not produce a moving picture. I get a lot of boxes tring to produce a picture but it seems I just need a little more signal. I am going to go to radioshack and get an amp for ant to see if I could get what i need. Any suggestions would be nice. What is the signal strength that you need to get a picture?