[JRTJH]

If your bedroom TV is connected to the rooftop TV antenna and both TV's work with the booster switch on, then if you turn the booster switch off and have cable on the "main TV" you should also have cable on the bedroom TV. Possibly there is a different setup procedure for that TV. Change it to cable, run a channel search and it should work (assuming both TV's work with the rooftop, the connections are the same for cable)...