Hi, i have a smart tv, which i installed and after autotuning it, gave some satellite tv stations as DTV. Although the channels did not show pictures or audio then, a few weeks later i got pictures on almost all those channels for a few hours. Since then, i can see the names of the channels, but no picture. I have checked for support in forums online and i have read that i need an antenna. My question therefore is, can i use a satellite dish as an external antenna without having to use a decoder, is there a type of converter i need, or what do i do to get picture, bearing in mind that the TV has shown pictures for these channels before.