I had ordered a AverTV Bravo Hybrid (H788) and so I've seen/used the AverTV Media Center software and know where you're coming from.
Unfortunately, as far as I can tell, the software is looking for DAB which are used in Canada but not in the USA.
[ame="http://en.wikipedia.org/wiki/Digital_Audio_Broadcasting"]Digital Audio Broadcasting - Wikipedia, the free encyclopedia@@AMEPARAM@@/wiki/File

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To add insult to injury, the iBiquity HD Radio system was chosen for the USA since the Military has claim over the frequency that DAB works in.
[ame="http://en.wikipedia.org/wiki/HD_Radio"]HD Radio - Wikipedia, the free encyclopedia@@AMEPARAM@@/wiki/File:FMi_201_FM_and_HD_Radio_Transmitter.JPG" class="image"><img alt="" src="http://upload.wikimedia.org/wikipedia/en/thumb/d/d6/FMi_201_FM_and_HD_Radio_Transmitter.JPG/220px-FMi_201_FM_and_HD_Radio_Transmitter.JPG"@@AMEPARAM@@en/thumb/d/d6/FMi_201_FM_and_HD_Radio_Transmitter.JPG/220px-FMi_201_FM_and_HD_Radio_Transmitter.JPG[/ame]
And yes, HD Radio uses the same FM band (88-108MHz) as regular analog FM radio stations use.
That extra hiss in your analog station sound, thats the HD radio signal.
PS: HD monkier is Hybrid Digital, not High Definition