huh? I'm unsure what you're asking.
OTA (to me) normally means 'Over The Air' in the respect of using a traditional tv/radio antenna. So I'm not sure where you're going with this question.
Downloading channels? Are you talking about the channel mapping, or channel content? I'm not sure how channel mapping is working right now, are they currently updating your channel maps automatically, or are you still required to scan the sat or manually enter new channels?