I don't think the HR10 collects guide data from the OTA signals - it gets it from the satellite along with other channels. If it's not a channel that TiVo/Tribune knows about, you won't see guide data for it.
I know that theoretically the ATSC signal can include guide data for some days out, but many stations don't send it.
I know that theoretically the ATSC signal can include guide data for some days out, but many stations don't send it.