First, your station will need to team up with a geofencing provider like Placecast or Location Labs.
You’ll sell the geofencing opportunity as part of a larger package that includes broadcast promotion. For example, it might be a retailer with 3 locations. In your broadcast promotion, you’ll let listeners know they can sign up for alerts from your client. They’ll receive alerts when they are within a half a mile of any of your client’s locations.
Your client could also choose other locations to send alerts beyond their store locations. For example, a golf retailer might want to set up a geofence around the closest golf courses in addition to its stores, so people can receive alerts about products that are cheaper at their stores than buying them at the club house.