Hello Mario - here are the steps.
1. Coax from wall to 2-way splitter
2. A/v Output of splitter with coax to your set-top digital box
2.(a) Out of digital box with RCA cables (Yellow - video / Red - RightAudio / White - LeftAudio) into the TV
3. The other A/V output of splitter to your DTA adapter. Out of your DTA adapter into your TV's coax RF input.
Note about step 3: If your TV is digital capable you may not need the DTA adapter. If you have anymore questions and/or if this does not help. Please feel free to email me at
we_can_help@cable.comcast.com.