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There is no good way to use only one TV for a set-top box, only in the bedroom where a set-top box is installed.
You can see, just because it is an analog signal, so there will be relatively few stations, about 30 units, and the set-top box is a digital converter, and there are more digital signal stations.
If needed.
Use at the same time. You'll need to buy another one. >>>More
No, you can connect to the room TV with wifi.
What kind of set-top box, if you are equipped with a cable TV set-top box, then any cable is useless, and you need to get another box box. Or if you have broadband at home, you can also buy a Xiaomi box or something like that.
Please ask the cable maintenance master to take a look, it is estimated that the quality of the branch device is too poor.