"SFTV_troy" wrote ...
I don't see how a discussion about AM radio could be
offtopic in a Radio Tech group or a Car Audio group.

Then you apparently don't understand the difference
between "radio" and "audio". Even more reason why
you should cease cross-posting.

You exhibit the kind of behavior that gives Google Groups
a bad reputation. People are starting to automatically
filter out all postings from Google Groups as *noise*.
Don't spoil it for everyone.