PILLAR BOX will give you black bars on the side but the image will be the same as if you were watching it on a regular 4x3 tv.
ZOOM does not look well on 4x3 images but fine on LB 4X3 programs.
STRETCH will do just take the sides of the image and make it fit the screen.
I let my tv do the upconversion and leave the hr20 set to native resolution.
I would also try the stretch with your regular tv remote and with the 480 4x3 programs for directv and see how that looks.
ZOOM does not look well on 4x3 images but fine on LB 4X3 programs.
STRETCH will do just take the sides of the image and make it fit the screen.
I let my tv do the upconversion and leave the hr20 set to native resolution.
I would also try the stretch with your regular tv remote and with the 480 4x3 programs for directv and see how that looks.