I don't know if this addresses the issue the OP has been having or not, but while wandering around over at RV.net, I came across this thread ...
RV.Net Open Roads Forum: Class A Motorhomes: Unusual Event with our Television
Maybe it'll fix people's problems. I've got a Seiki in the bedroom & haven't had any trouble with reception. If nothing comes in, I usually do a scan & all is well.
Thor Forums
