Sec. 17.2  Definitions.

    (a) Antenna structure. The term antenna structure includes the 
radiating and/or receive system, its supporting structures and any 
appurtenances mounted thereon.
    (b) An antenna farm area is defined as a geographical location, with 
established boundaries, designated by the Federal Communications 
Commission, in which antenna towers with a common impact on aviation may 
be grouped.
    (c) Antenna structure owner. For the purposes of this part, an 
antenna structure owner is the individual or entity vested with 
ownership, equitable ownership, dominion, or title to the antenna 
structure. Notwithstanding any agreements made between the owner and any 
entity designated by the owner to maintain the antenna structure, the 
owner is ultimately responsible for compliance with the requirements of 
this part.
    (d) Antenna structure registration number. A unique number, issued 
by the Commission during the registration process, which identifies an 
antenna structure. Once obtained, this number must be used in all 
filings related to this structure.
[ 32 FR 8813 , June 21, 1967, and  32 FR 11268 , Aug. 3, 1967, as amended at 
 39 FR 26157 , July 17, 1974;  61 FR 4362 , Feb. 6, 1996]