That's an important question, but I think David already hit on the even more basic question. If WGN-HD isn't in your HD tier, it sounds like the WGN you're watching is just the regular SD broadcast. The fact that it says "In Hi-def where available" unfortunately sounds like it doesn't apply in your case -- it's probably referring to those areas where the separate WGN-HD channel is available. I thought B was joking, but who knows. :) Actually, I wasn't. Before I got an HDMI cable, I had some channels come in better than others. Ah. Figured you were just poking fun at the typical Best Buy/electronics store employees. My bad. As long as you're using an HD connection (like HDMI or component), it shouldn't make too much of a difference. There isn't a significant difference, if any, between the two. The main difference is the convenience of having a digital audio signal tossed in with the video on HDMI instead of having to use a separate audio connection. I'd have to know a lot more about your setup to know why HDMI might've happened to have made a difference but it could've been a lot of things. Much more likely that he's just not watching an HD channel given the fact that he said he had a beautiful picture with ESPN.