Since the HD-GUI is natively 16:9, it will always look somewhat squished vertically on a 4:3 set regardless of the resolution settings of the receiver or the native display resolution of the set as with any other 16:9 image on a 4:3 display.
I use an old 4:3 SD LCD in the kitchen fed from a component connection to an HR21-200 locked at 480p output res., and 4:3 AR in the receiver settings. And the HD-GUI is indeed squished vertically to a degree.
I use an old 4:3 SD LCD in the kitchen fed from a component connection to an HR21-200 locked at 480p output res., and 4:3 AR in the receiver settings. And the HD-GUI is indeed squished vertically to a degree.