i need help, i just install another set up box in the other room ,now my father can watch tv in the room,but now i have no wifi connection,either i can watch 2 tv at the same time or watch only one tv and surf my internet( need to unplug tv cable or internet from the cable point)
Just get a (TV) Cable splitter and a short Cable line from any computer shops.
The Splitter come with 2-way or 3-way, depend on how the number of connection you need.
The short Cable line is to connect from the Main point (wall) to Splitter IN.
2-way is for 2 OUT, 3-way is for 3 out, etc.
3-way is for split into 3 out, connect to TV, Modem, Set-Top Box, if you want to run separately for TV and Set-Top box.
Afterall, Set-Top box connect to TV is using HDMI, Audio/Video cable.
Most possible you may have the splitter, common is 2-way.
Just get the 3-way, even if you need is 2-way. Spare OUT for any future need.