Midland
"You have a Midland accent" is just another way of saying "you don't have an accent." You probably are from the Midland (Pennsylvania, southern Ohio, southern Indiana, southern Illinois, and Missouri) but then for all we know you could be from Florida or Charleston or one of those big southern cities like Atlanta or Dallas. You have a good voice for TV and radio."
I got my BFA in Theatre and Stage Performance so pretty much my accent (if I even had any) was striped away by my voice coaches. Also the best news casting training facilities are located close to my home. Most news casters get their start there because of the neutral accent.
Larinda, to my ear, this accent is the most pleasant one. And perfect for newscasters. It sounds very even and "all-American". I work with many people with your accent.
Incidentally, Walter Cronkite was born in St. Joseph, Missouri--leaving before his teenage years, but his accent was doubtless influenced by his environment as well as his communications training. In his Wikipedia biography, it says, "Cronkite trained himself to speak at a rate of 124 words per minute in his newscasts, so that viewers could clearly understand him. In contrast, Americans average about 165, and fast, difficult-to-understand talkers speak close to 200 words per minute."