The built in ATSC HD tuner is for OTA or broadcast HDTV.
If you have Direct Tv or Dish Network, you will have to get a HD reciver from them.
All HDTVs will have ATSC HD tuners in them by next year per FCC.
If your getting Direct TV the cable card slot will go unused.
Just purchased 42" Panasonic Plasma with Built-in HD tuner and Cable Card ready. I am looking at getting Direct TV; Do I need the HD Receiver, since I have a built-in Tuner? Also, do I need to pay the extra $10.99/month subscription(after 3 months free) for HD?
Second questions, For TV's without a buiilt-in HD Tuner, do they need extra equipment besides the HD Receiver? If not what advantage is paying extra for a built-in tuner on a HDTV(besides over the air/antenna HD)?