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The Sony literature says that the X90K has an ATSC 3.0 (NetGen) tuner. The television does NOT have built in antenna but an external antenna connected to the TV will be able to handle BOTH ATSC 1.0 and 3.0 signals. ATSC 3.0 is in it's infancy in many markets. While ATSC 3.0 is truly 4K capable, it will likely be a couple of years before we see much over the air 4K broadcasting. It's certainly coming; I (we) just need to be patient.
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