We can add grey or colored side bars, but have found with past experience that most viewers don't like this..
I have a 520 as well..you can get around this by putting the box in 480p mode..it will then allow you to fill the screen,If I'm correct, it has been a while since I have done that..
You are correct. Switching to 480p allows you to set the ratio to "cropped", which will fill the screen quite nicely. Unfortunately, with the Zenith, that's kind of a pain. You can't switch from 1080i to 480p with the remote. Instead, you have to get up and switch it from the front panel.
The only other option is to switch to 480i (which you can do with the remote), and then switch inputs on the TV. That's not a problem for me, but I can see the wife getting a little frustrated with that...
Looks like I'll be setting up macros on the remote pretty soon...
Bob, thanks for taking the time to respond. It's nice to have a local engineer on the forum who is willing to answer our questions (and who understands our passion for digital / HD reception).