Radio stations in Florida, Puerto Rico and the Virgin Islands must have filed their license renewal applications on or before October 1, 2011. These stations must air post-filing on-air announcements on December 16.

Radio stations in Alabama and Georgia must have filed their license renewal applications on or before December 1, 2011. Post-filing on-air announcements for these stations must be aired on December 16, January 1 and 16, and February 1 and 16.

Radio stations in Arkansas, Mississippi and Louisiana must file their license renewal applications on or before February 1, 2012. These stations must air pre-filing on-air announcements on December 16, and January 1 and 16. Post-filing on-air announcements for these stations must be aired on February 1 and 16, March 1 and 16, and April 1 and 16.

The FCC provides sample text for pre-filing and post-filing announcements here.