I replaced my signal booster with a the new Winegard
Sensar Pro, and along with the Wingman attachment to the Winegard crank-up antenna we get a whole bunch of channels. 37 in fact on last trip out, but we were close to town.
The SensarPro seems to do a better job of passing the signal along to the 2nd TV than the old fashioned one did. Also check the tuner in the TV, some older sets aren't able to bring in a lot of the digital broadcast signals. When you do a scan on the bedroom, note how many analog channels and how many digital channels it finds, then compare to see if the other TV is lacking in the digital side.