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It sounds like the signal strength / quality is marginal - this could be due to damage to the aerial or antenna cable - or even the direction the antenna is pointing. As sharkbite says, the Menu of a digital TV will tell you the signal strength and quality you are receiving on each channel - if it is low, you can get pixellation, freezing, sound drop-outs, etc.
Do you have a set-top box or PVR or similar which gives a better, more consistent signal? You will often find that the tuners of various devices will have quite different sensitivities, so one device can give a very poor picture, while another has no troubles at all when plugged into the same antenna point. You can pick up cheap HD STBs for under $50, so it is a pretty cheap experiment if you don't already have another device you can test.
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