No, I mean, the "radio announcer" and thus the "news reporter" voice was modeled after the Ohio accent, because it was seen as a non-accent. You're right that we have one, it's just so incredibly bland, that it comes across as not one at all.

Here's an article that goes into further detail

Vizetelly, who established a school for announcers at CBS, was concerned with maintaining the “purity” of American English. In his mind, the Midwest was the place to be—and Ohio in particular.

Vizetelly and other educators felt that broadcasters could evoke trustworthiness and objectivity by imitating the speech of the “heartland.” Eventually, when radio announcers and TV journalists began sounding like they were from the Midwest, the “broadcaster’s dialect” became understood as normal.