I am a new traveler on the cut-the-cable highway. We have an old TV (1993), and right now my husband is refusing to buy a new one. The TV serviceman is coming soon to hook up the Channel Master antenna. I have a digital converter box here waiting for him. Then I would like to get the ROKU. I have high-speed broadband through Time Warner. So far, so good? Will this work if I don't have an HD TV? Which ROKU box do I need?