A/B switch is one where you can choose between sources for input to a TV or converter box. Imagine you live some where the TV stations are in 2 directions. You don't want a rotor (cost and hassle of waiting for it to turn). You could run 2 coaxes, one from each antenna to the A/B switch, then you just choose antenna A or antenna B.
Unless the coax from the splitter to the bedroom is very long (50 ft or more) then most likely you just need to rescan with the bedroom TV again now you have the antenna split to that TV as well.
Read this post, try the procedure. If that doesn't work post back here and we will go to step 2.
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A/B Switch Question
Linear Mode
