In theory, it should be possible to optimize the antenna aim for channel 9 by monitoring its pilot carrier, which is at 186.31 MHz.
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It is not possible to receive digital TV audio with a scanner or AM/FM receiver.
Before the transition from analog to digital TV in 2009, audio from analog TV stations could be received in wideband FM (WFM) mode. Each audio channel used 100 kHz bandwidth.
The 8-VSB modulation used in ATSC (DTV) has a pilot carrier that serves as a reference frequency for DTV receivers and can be heard on an AM or FM (narrow band) receiver. The pilot carrier is approximately 310 kHz (.31 MHz) above the lower band edge. The exact frequency used may vary because the transmitted signal may be offset slightly to reduce interference.
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http://wiki.radioreference.com/index...on_Frequencies