Our fair use Wikipedia:Non-free content criteria #8 specifically prohibits the use of fair-use images in galleries. One logo, used to identify the subject of the article, is permitted. If there is actually encyclopedic discussion - with reliable sources - about the history of the logo, if this is actually a subject of any scholarly discussion, then the history of the logo may be useful. However, in most cases, old logos just don't have a place in an article about a TV station. ()(Talk)