This statement is not true at all. Fox News correspondents are certainly qualified in what they do. Perhaps it is the requirement of the place they work at, which requires them to act naïve and to act totally ignorant of all the facts. Perhaps, they get to say whatever they are asked to say and not the other way round. Of course, being attractive is one of the traits that could land you in the position of a correspondent, but being dumb is certainly not a requirement.
Hence, one must consider taking a respectable degree in journalism and have the right skills to take such a position.