Does the main tv work with antenna? If yes then antenna and booster is working. So look at 2nd tv is coax cable going to the right input terminal? If yes, look to see if tv has the right source or input (antenna is source) selected in menu? If yes, then you should remove wall plate next to 2nd tv to make sure coax in back side of plate is there and is snug. If yes, take note of coax cable color and post back.
2016 Ford F250 XLT 4X4 6.2L
2015 Rockwood Signature Ultralite 8329SS
Nights camping in 2016: 19 nights
Miles traveled in 2016: 2,575