A resolution of 852 x 480 is *NOT* HD. Standard definition is something like 720x480.
If you want HD support at the intended resolution, you need:
1280x720 (for 720p, used by Fox, ABC, and ESPN)
1920x1080 (for 1080i, used by everybody else with HD)
If you do not have a display that does not natively support the specified HD resolutions, it will have to *DOWN-CONVERT* (degrade, perhaps?) the signal to something that it can display. If you are going to spend the money, wouldn't you want some proper HD support?
-SUO