The Quiet Hour - Radio, Literature, Health, and Worldwide Mission Outreach begun in 1937 with Pastor J. L. Tucker's listener-supported radio broadcast in Portland, Oregon. - http://www.thequiethour.org
The Voice Of Prophecy - One of the oldest continuous radio broadcasts. Founded in 1929 & presently aired by more than 1500 radio stations around the world. - http://www.vop.com/
AWR: Adventist World Radio - International religious radio program devoted to spreading the Gospel, particularly in countries where other means of evangelism are not possible. Some audio files. - http://www.awr.org/