I have installed a new antenna and the picture is great and I have a strong signal. The audio seems fine but the picture is jumpy. Thanks for suggestions.
Yeah; DTV tuners don't get jumpy unless something is really wrong. If you have good signal strength, but there's a problem with the picture, it's almost always a cabling problem. Unless your tuner has gone bad, in which case you just need a new box or a new TV, as the case may be.