Radio stations in North Carolina and South Carolina must have filed their license renewal applications on or before August 1, 2011. Post-filing on-air announcements for these stations must be aired on September 16 and October 1 and 16.

Radio stations in Florida, Puerto Rico and Virgin Islands must file their license renewal applications on or before October 1, 2011. These stations must air pre-filing on-air announcements on September 16. Post-filing on-air announcements for these stations must be aired on October 1 and 16, November 1 and 16, and December 1 and 16.

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

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