Find a dead spot on another radio. Set the adapter to broadcast on that frequency. The radio should, when skipping, now see this as a valid radio station and stop there.

At least that is what I'd try. I've had mixed results with my radio adapter, but that is larger due to it only have 8 choices to broadcast on and Boston has few true dead spots. Plus I drive 45 minutes and the true dead spots aren't the same in the city and near 495.