Brevity and clarity always help. Don't be rude, crude or cute. That doesn't go over well with normal human beings, or with journalists either. I don't waste time listening to a foul-mouthed person, despite the extensive training the Army gave me in that form of communication, and I don't expect anyone else to do so. Don't be surprised if a reporter is not sitting by the phone waiting on your call.
Good reporters spend a lot of time outside the office where news happens.
Always identify yourself. Anonymous calls are of dubious value. If you want to protect your identity, leave your name and make it clear you do not want your name used or shared. His opinions are his own. Let us hear from you.