S-video, composite and component should all give a better picture than a standard RF connection. The RF connection requires an additional modulation to send the signal to the TV as channel 3 or 4. Have you mixed the terms "composite" and "component"? Composite is a single run of cable with RCA terminations. Component is a three cable RGB with RCA terminations. Is the box HD? If so, you must use the RGB to get the HD signal. S-video cannot pass an HD signal.
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