teleview

Yes Ok to use the coax that is in or on the house , however , there must be no active pay cable delivered services , no cable tv , no cable internet , no cable phone service , on the coax that is used for the antenna.

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For a test of reception of Digital Broadcast Tv reception.

No active pay satellite service on the coax that is being used for the antenna.
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Daisy chained , means a splitter connected to another splitter connected to another splitter connected to another splitter , etc..

This type and kind of signal distribution makes for a very weak signal at the end of the daisy chain.

Putting terminators on any unused connections of the splitters of the daisy chain Will Not Help the Signal Strength.