TVPuzzle

As far as I know all that you do is capitalize all the call letters.

Underscoring (underlining) is the same as italicising. The others are basically right – spell it or punctuate it as the channel does itself, it is a corporate “person” and the call letters are its “name”. They are typically capitalised but in any event, follow the channel’s own convention regarding capitalisation, spacing, etc. As the source of a quote or some piece of information, it wouldn’t be amiss to italicise it, as you would in the same context italicise a book/journal title.

You can do it either way as long as it is stated that it is a TV channel. Italics is usually used for names of organizations. Usually it used once when it is first stated, after that you can address it with just a capital letter.

italic is the best, but it depends on you. if you’re doing it for a school project (if you’re in school) it depends on the teacher.

Punctuate it just it appears on the tv. Most use capitalized letters. NO DOTS but you can bold it

Just go like this:
The evening news on WABC-TV.