Ken,
Later Mavis was a "booth announcer" (for a very short while, in 1970-1971?) at WIIC-TV.
That's back in the days where you sat around waiting to announce live continuity.
I was visiting a friend at WTAE-TV many years ago when Henry DaBecco was doing this job there.
There was a station break. He watched his monitor and then said "WTAE-TV Pittsburgh", after which he went back to reading the Post-Gazette. Things have changed! Have fun while you can. I was glad that I was able to do those things back then. I couldn't possibly do that today. It is a different world.