No, to my knowledge.
A simple "WNDZ Portage" is all that's needed sign on or sign off.
Years ago, they were (simulcasting)//88.5 WSFI and would say "tune in to 88.5 WSFI for programming to continue. WNDZ will return to the air..."

https://www.law.cornell.edu/cfr/text/47/73.1201

Hope this helps!
John