Does anyone know where the Antenna for the Tire Sentry System is located on a 2006 TS Select 45. I have followed a coax cable from the front where the display is down the frame in the lower bay to the bay end and the Black tank is located. I have a Mfg document that suggest it be ran to max cable length or to the rear bumper of a coach. I see nothing at the rear area. My sensors do not work and I am trying to figure out why. All batteries have been replaced on the valve sendor units??