The dancing lines are most likely "Vertical Interval Reference" - Embedded data that would not have been displayed by traditional analog sets.
http://en.wikipedia.org/wiki/NTSC
In some cases this is were closed caption date is embedded.
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If the well is dry and you don't see rain on the horizon, you'll need to dig the hole deeper. (If the antenna can't get the job done, an amp won't fix it.)
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