Can you watch the tv tuner as a passthrough, not having to go through network to see broadcast atsc on your tv?
That's a very confusing question, can you go into a lot more detail ?
I would like to use the slingbox as a tuner connected directly to my tv
No. The Coax OUT on the Slingbox is ONLY a passthrough of the Coax IN. the internal Tuner output is routed ONLY onto the Internet.
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