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Latest statistics I heard, 85% of households have non-OTA service; but 22% of TVs are OTA only. Not all secondary sets are connected to non-OTA service.
It's also true that digital tuners/demods have improved greatly as the manufacturers learned what aspects of performance are most important for reliable reception. The same thing happened with analog sets in the beginning. Some of the early tuners had lousy noise figures. By the time the FCC set rules for noise figure, designs were exceeding those requirements.
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