You wan watch the OTA on TV2 if the box is set to single mode (both tv1 and tv2 display the same thing). Once you switch to dual mode, you can't see the OTA channels on TV2. These are of course in 480i on TV2.
The 622 converts the digital HD signal, it does not pass through any signal. You could combine the ota signal to the rf output and send both to tv2 that way.
In Dual mode TV2 CANNOT see the OTA digital tuner.
In Single mode there is no TV2, per se, although the TV1 and TV2 connectors on the back output the same thing and therefore OTA can be seen there is no way to watch anything else on another channel.