PUBLIC NOTICE
Federal Communications Commission
445 12th St., S.W.
Washington, D.C. 20554
 
News Media Information 202 / 418-0500
Internet: http://www.fcc.gov
TTY: 1-888-835-5322
DA 07-4114
Released:  October 2, 2007
Clarification of Notification Procedures for
Dual Antenna Hybrid Digital Operation
The Second Report and Order, First Order on Reconsideration and Second Further Notice of Proposed 
Rule Making in MM Docket No. 99-325 was published in the Federal Register on August 15, 2007. 
Therefore, the effective date of new notification procedures for FM Broadcast stations operating in hybrid 
digital in-band, on-channel ("IBOC") mode with dual antenna systems is September 14, 2007.
In response to several inquiries from the Public, this Public Notice clarifies the notification procedures for 
stations currently operating with dual antenna systems under Special Temporary Authorization ("STA").  
The technical information requirements for STA requests for dual antenna operation, which were set forth 
in a Public Notice released on March 17, 2004,1 are substantially the same as those which will be required 
for dual antenna IBOC notifications going forward under the new rules adopted in the Second Report and 
Order.  In addition, those stations that commenced dual-antenna IBOC operation via STA already have 
been designated as hybrid digital stations in the Media Bureau's Consolidated Database System 
("CDBS").  For these reasons, FM stations that are currently operating digitally under STA are deemed to 
have provided the notification required by newly adopted 47 C.F.R. Section 73.404, and such stations will 
not be required to file a new notification with the Commission, unless a subsequent change is made in the 
technical parameters of the IBOC operation or the technical contact information.
For additional information, contact Charles N. Miller or Ann Gallagher at the Audio Division, Media 
Bureau at (202) 418-2700.
By:  Chief, Media Bureau
-FCC-
  
1 See Public Notice, Use of Separate Antennas to Initiate Digital FM Transmissions Approved, 19 FCC Rcd 4722 
(MB 2004).