My player seems not able to upscale the signal

Upscaling will only occur when playing DVDs. You have to use an HDMI connection from the DVD player to the tv. For upscaling of DVD's you will also have to setup the upscaling resolution in the DVD player's setup menu. Be sure to set the resolution to one that your tv will support.

If your tv does not have a HDMI input, then you will not be able to use the upscaling feature.

Upscaling will not occur on antenna signals. This is not possible because the hardware (inside DVD player) is only meant to upscale DVD video.

Again, to upscale DVDs ONLY, you will have to have an HDMI cable going from DVD player to TV, set up your upscaling options on your DVD setup menu and have a TV that has a HDMI input and is capable of recieving the upscaled resolution you have set your DVD player to.

If you have any further question regarding this, let me know!