True, without stories, they have no audience. The trick is for media persons to decide which of the many daily submissions to use.
That is why your news release must be outstanding. "Author XYZ publishes new book titled ABC" just does NOT work!! Your news release also must be sent to a person, not a general mailbox. When No One is responsible for something, No One will respond.
Then you must follow up, follow up. Often your email is just deleted because there is no time to pay attention to it so make sure that the subject line of your email is VERY interesting. Send it out and then follow up, follow up.
If you are not getting a response, perhaps you need to send out a different news release with a different headline. Try, try again.
Don't forget to contact radio shows, especially talk-back radio if you have a topic that makes a good discussion or that a wide range of listeners can relate to and feel inspired to call the show.
Keep trying.
Denise