If the first station you contact just plain refuses to take on the show, try another one. Sometimes a station won't be interested no matter how many listeners stand on their heads. Sometimes a station warms up to the idea right away but simply doesn't have a time slot open. Give the station time to do what it needs to do to determine if and when it can add the Grateful Dead Hour. If it declines the offer, turn to another station in your area.
Every radio station wants more listeners.
We need to show them that there are hundreds, even thousands, of fans ready to tune in and stay tuned. Write to your local station's program director and say in your own words why you'd like to hear the Grateful Dead Hour. A week or two after you write, place a call to the station to see if anything has developed, and ask if there's anything you can do to help make it happen. Letters from a large number of listeners will be more persuasive than multiple contacts from a small number of people. Be positive, and be polite.