HD Connection - XFinity

I currently do not have HD service with Comcast. I just purchased a new TV that is an HDTV. Am I required to add the HD service in order to view that TV, or can I watch it with just plain 'ol SD? If I must have the HD service, then do I need an HDMI cable to hook up the box, or will I need an entire new box as well? (My box was installed new in July of 2016.)

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