You can go to RadioShack and get an A/V box like:
5-Way Tilting, Auto-Sensing Stereo A/V Selector [5 inputs and 2 outputs (RCA)]
http://www.radioshack.com/product/index.jsp?parentPage=search&summary=sum...
Your configuration will be:
1) Dish STB---> 2) A/V Selector--> 3a) SLingbox & 3b) TV


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