Sec. 95.51  Antenna height.

    (a) A land station antenna (the land station's radiating structure 
(for transmitting, receiving or both), including the tower, mast or pole 
supporting it and everything attached to the structure) must not be a 
hazard to aircraft. The licensee of a GMRS system must get FCC 
permission (see Sec. 95.83) before the uppermost tip of an antenna may 
be higher than normally allowed in paragraphs (b), (c) and (d) of this 
section.
    (b) Regardless of any other requirement of this section, an antenna 
may always be at least:
    (1) 6.1 meters (20 feet) above the ground or above the building or 
tree upon which the antenna is mounted; or
    (2) Equal to the height of an existing antenna to which the land 
station antenna is attached.
    (c) The antenna may be as high as 61 meters (200 feet) above the 
ground, unless it will be within 6.1 kilometers (20,000 feet) of an 
airport or heliport.
    (d) If the antenna is near an airport or heliport listed in the 
FAA's (Federal Aviation Administration's) Airport Facilities Directory, 
or near an airport or heliport operated by the Department of Defense, it 
must not be higher than:
    (1) One meter higher than the airport elevation for every 100 meters 
from the nearest runway if the runway is longer than one kilometer 
(3,281 feet), and is within 6.1 kilometers (20,000 feet) of the antenna; 
or
    (2) Two meters higher than the airport elevation for every 100 
meters from the nearest runway if the runway is no longer than one 
kilometer (3,281 feet), and is within 3.1 kilometers (10,000 feet) of 
the antenna; or
    (3) Four meters higher than the heliport elevation for every 100 
meters from the nearest landing pad if the pad is within 1.5 kilometers 
(5,000 feet) of the antenna.
    (e) If the FCC grants permission to put an antenna higher than 
normally allowed in paragraphs (b), (c) and (d) of this section, the 
licensee may have to mark the antenna with bright paint and light it up 
at night (see part 17 of the FCC Rules).
    (f) The antenna for a small base stations or for a small control 
station must not be more than 6.1 meters (20 feet) above the ground or 
above the building or tree on which it is mounted.
[ 48 FR 35237 , Aug. 3, 1983, as amended at  53 FR 47715 , Nov. 25, 1988]