hal

You should check the coax connections, especially in the area below the refer. (accessed through the removable grille and from outside the trailer). There have been several that were not properly installed. The thin copper wire that runs through the center of the cable was not trimmed long enough to make contact with the opening on the female end. Being that your problem is "intermitant" it might have been able to temporarily make contact and then as a result of vibrations of use, it may have withdrawn from reaching the connection. While there, check all your connections, (plus those on the amplifier in the trailer and those that are attached to the antennae).

Hal