STOP.
Some posts above may be misleading. You have two satellite tuners. They both can record HD or SD. They are independent of the outputs, TV1 & TV2. The TV1 output can put out HD. The TV2 output can only output in SD. Those two satellite tuners can feed one or both outputs at the same time. They can also record to the built in HDD. You can record two programs HD or SD, to the DVR HDD at the same time, while also watching one of those programs, or watching another program already recorded- for example.
It's really simple, once you realize that you need to remember that the inputs, tuners, are completely separate from the outputs, TV1 & TV2. BTW TV2 can output an HD program, it will just be downrezzed to SD.
And then you add the other tuner input, the OTA module. In the ViP722, there is one built in OTA tuner. In the ViP722K, there are 2, if you have the OTA module installed. Again, completely independent of the outputs.
Now if you want both TVs to watch the same thing at the same time, you may leave the box in "single" mode. If you want independent viewing on each TV, you can shift to "dual" mode. Look behind the door on the front of the box and you'll figure it out. In dual mode, the second remote operates in UHF mode to control TV2 output.
Remember: There is no TV1 "tuner." There is no TV2 "tuner."
TV1 & TV2 refer to outputs only.
The ViP series are some impressively capable boxes. I'm sure you will come to love them. If you need more clarification or tips, please do not hesitate to ask.
BTW - While watching a program off the DVR and you come up to a commercial, press the yellow clockwise curved arrow button at 2 o'clock from the pause key. That'll put a smile on your face!