I listen to NPR National Public Radio. They have national coverage and are well respected. The link to the Contact Us page will allow you to submit a press release or a story item. They may want to verify your story before they release it and they may request an in depth story.
I also follow Science Daily which is a daily online science news magazine. They normally re-publish articles and press releases that have been verified. It seems to be followed by TV news stations because I see the same story that I just read online.
