So to level set, are you discussing this:
The plate on the right is the 12V and Power Antenna (Not Satellite, but the roof mounted Batwing). So one question at a time.
You do NOT need a 12V Television for any TV reception (Antenna, Cable or Satellite).
Not to be insulting, but could you be confusing the roof mounted TV antenna for a Satellite system? If you have just the roof mounted TV antenna (crank on the inside to crank up, then can rotate to get the best signal) then you need only a digital television which is basically any newer TV set.
I suspect you're talking about a TV antenna, not satellite.