Libel is a written defamation. Defamation or "defamation of character" is spoken or written words that falsely and negatively reflect on a living person's reputation.
Generally, radio and television broadcasts that are defamatory are considered to be libel, rather than slander. The words the anchor or reporter speaks are usually written down before they are broadcast, and such scripts are valuable evidence of whether or not defamation has occurred.
There are attorneys who specialize in defamation lawsuits. You can find a listing of specialists in your area at AttorneyPages.com.