The NTIA specs, for the "subsidized" converters allow it to be used. Most of the newer chipsets for DTV have the interface capability, but this is only one of a couple of boxes I have seen that implement it. This is done using signal strength and signal "Q" (Quality, using the error correction signals within the STB), and the settings are then stored in the STB. When you scan the STB, it goes to channel 2, tries all combinations of antenna "directions" (it can create 16 possible azimuths by electronically switching the elements), and then.if it sees something resembling a DTV fine tunes the filters, azimuth, and preamp gain for the best signal.
The power and control signals are multiplexed on to the single coax, using a little interface box that sits behind the receiver. The preamp has several gain settings, and has bandpass filters for the major TV bands (VHF-Low, VHF-High, and UHF). The antenna is a pair of crossed dipoles, together with a solid-state routing matrix, which feeds different combinations of the four antenna elements to a preamp. I have one of the prototypes of that unit, together with the DX Antenna DTA-5000:
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