[Sean]

I remember my dad restored a 42-390 about 10 years ago. I seem to remember the wire around the back edge of the cabinet as not being continuous. It is the antenna for the old FM band that this set covers. The service information has contradicting information on it. The parts list labels it as the FM Loop Aerial which would indicate it is a loop or continuous wire. The alignment instructions refer to it as the Dipole Aerial which would indicate it is not a continuous wire but two separate lengths of wire as I seem to remember it being. I just noticed that the 42-1015 I have uses the same part number for this aerial as the 42-390. I will look at mine and report back.