I bought our TST system at a RV show and I was having a problem with one or two of the sensors being picked up by the control panel. I went back to the show and they offered to come and install them for me after the show. They took all the sensors across the street about 150 feet away and programmed them into the control panel, seems there were too many other TST sensors on coaches around my coach...... They installed the repeater right on one of the chassis batteries (my battery bank is at the rear of coach, curb side), works great.