What type of set top box? What outputs are available on the box and what inputs are on the TV?
For a basic OTA digital to analog converter, you put the antenna coaxial cable to the antenna in of the box. Then either connect the coax out to the TV's antenna in (set the tv and the box to Channel 3 or 4) or connect the composite out to the composite in of the TV (set the TV to the AV source).
For a set top box that has a composite out and a TV that only has a coaxial input, you need to add a RF modulator. Something like this:
http://www.radioshack.com/product/index.jsp?productId=2103095 . If you have a composite input on the TV, use the composite cable directly; the modulator will decrease the signal strength.
There are other converters for component out to composite video. See
http://www.svideo.com/ypbpr2svideo.html . Going from a digital source (HDMI) to analog can be done but the resulting signal is poor compared to the original. Also DHCP content will not be transferred. See
http://www.gefen.com/gefentv/gtvproduct.jsp?prod_id=5280 for an example.
I hope this helps. Please add a comment with the specifics of your set top box and tv for the best choice for your situation.
Cindy Wells
The product type entered was wrong. HT-X20
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