Thinking about cancelling my cable and DVR subscription (so sick of paying $17/mo for the DVR), getting an antenna (Mohu Leaf), and using a Roamio. A couple of quick questions: 1) How exactly does the Roamio get TV Guide information if I'm using an Antenna? Will I have to manually tell it what channels I get? I assume that if I were using Verizon or Comcast, I would just tell the Roamio who my provider is, and it would know what channel guide to download. But how does that work with an antenna? 2) Will it still have the capability of recording 2, 3, or 4 shows at once with a single antenna? I pretty much never need the option to do more than 2 (especially if I only have an antenna), but I'm just curious if it's even possible. Hmm... I think that's it. Thanks in advance for any answers.