If you are like me, you have a favorites list setup.
If so, then when you go into the guide now, you will not see your OTA stations.
You will need to tweak your favorites list, or go to the ALL option on your favorites. Hit Menu to access your favorite settings.
Once you do that, you will now see the OTA's listed in your guide
OTA channels will have their "number" listed in a dark grey. And are most notable in the format: :Channel - SubChannel" such as 5-1
Channel 5-1 WMAQ.... is the same as 5 WMAQ (MPEG-4)
The guide order in most cases will be this per channel:
SAT Provided MPEG-4
SAT Provided MPEG-2
OTA Channels and Sub Channels
(WTTW in Chicago has more then 1 sub channel... it has 3
This listing for WTTW shows a very good reason WHY OTA is important, even with out "HD" involved.
If you look, my Channel 11 (SAT Provided SD version of the WTTW), is showing one show.
If you look, my Channel 11-1 is showing a very different show. 11-2 is showing the same as Analog 11
Then 11-3 is showing another completely different show.... so OTA is important, even with out HD involved.
To directly enter an ota channel.
On your remote: Hit the base channel "5" then the dash button (lower left of remote), then subchannel "1"