Composite cabling is standard definition only, which is why you are seeing a less-than-desirable quality image and a smaller aspect ratio. I would recommend investing in an HDMI Splitter so that you can run the HDMI from the set top box to the TV and run Component cabling to the Slingbox, which will ensure that you are getting a High Definition picture on both devices. I've linked an example below:
You can also find equipment like this within standard electronics retailers like Best Buy; you would just need to ensure that the one you purchase has HDMI in and out, as well as Component out to run to the Slingbox.
I hope this helps!
Sling Media Technical Support
Thank you for the suggestion. I’ll give it a try.
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