PUBLIC NOTICE
Federal Communications Commission  News Media Information: 202 / 418-0500
445 Twelfth Street, S.W.  Internet: http://www.fcc.gov
Washington, DC 20554  TTY:  1-888-835-5322  
   
DA 07-3520
   Released:  August 7, 2007
REPLY COMMENT DATE EXTENDED TO SEPTEMBER 7, 2007,
ON PROPOSED RULES PERMITTING ANTENNA MODELING TO 
VERIFY AM DIRECTIONAL ANTENNA PERFORMANCE
MM Docket No. 93-177
On May 23, 2007, the Media Bureau released a Public Notice1 seeking comment on a 
proposal by an ad hoc technical group of radio broadcasters, equipment manufacturers, and 
broadcast consulting engineers, acting collectively as the AM Directional Antenna Performance 
Verification Coalition (“Coalition”).  The Coalition has proposed rule changes to permit 
applicants to use moment method computer modeling2 to demonstrate that AM directional 
antennas perform as authorized.  The proposed rules also would permit use of moment method 
modeling to assess the effects of tower construction in proximity to AM antennas.
Following the comment period, the Coalition requested extension of the reply comment 
deadline “in order to afford the Coalition adequate time to complete its review of the 
comprehensive comments filed in response to the Public Notice, respond to the issues raised in 
those comments, and coordinate with the members of the Coalition.”3 The request submits that 
the extension would not disadvantage any party, and would serve the public interest.  We agree, 
and therefore extend the deadline for reply comments to September 7, 2007.  
For additional information or questions on this matter, please contact Susan Crawford or
Ann Gallagher of the Audio Division, Media Bureau, at 202-418-2700.
By:  Chief, Media Bureau
– FCC –
  
1  Public Notice, “Comment Sought on Proposed Rules Permitting Antenna Modeling to Verify 
AM Directional Antenna Performance,” 22 FCC Rcd 9279 (2007). 
2 Computer programs to predict antenna performance are generically referred to as “moment 
method” or “NEC” programs.  NEC programs are based on the Numerical Electromagnetics Code moment 
method of analysis developed at Lawrence Livermore Laboratory, Livermore, California.
3 See “Request for Extension of Reply Comment Deadline,” (Aug. 2, 2007).