If I put all the local OTAs in my guide it would read:
2 (sat HD channel)
2 (sat SD channel)
2-1 (OTA)
2-2 (OTA)
4 (sat SD channel) - since we don't get 4 in HD yet, the SD channel is displayed
4-1 (OTA)
7 (sat HD channel)
7 (sat SD channel)
7-1 (OTA)
7-2 (OTA)
7-3 (OTA)
etc.
The OTA channels are color coded differently than the sat channels (other than this color coding, the OTA channels are treated the same as sat channels and you can use all DVR functions on them). Also, since I hide SD duplicates, the sat SD channels are not shown.
As far as getting the locals in your guide, once your AM21 and antenna are connected, you'll go through the OTA setup where you'll enter your ZIP. Here's where it gets a little screwy: The HR2x series does not scan for OTA channels. Instead, D* keeps a master database of OTA channels for each ZIP, so once you enter your ZIP, those predetermined OTA channels will be added to the guide.
Hope this helps.