I currently have a Hitachi Plasma (32HDT20) TV with the included Tuner box. It currently has Virtual HD built into the box which upconverts signals to 1080i? My question is, if I were to purchase the Terk TV55 HD antenna, would I still need to buy an HD box tuner, like the Samsung box for example? Could someone explain to me what would be the difference between an HDTV tuner box and Hitachi's own Virtual HD? Thanks!