Sec. 22.371  Disturbance of AM broadcast station antenna patterns.

    Public Mobile Service licensees that construct or modify towers in 
the immediate vicinity of AM broadcast stations are responsible for 
measures necessary to correct disturbance of the AM station antenna 
pattern which causes operation outside of the radiation parameters 
specified by the FCC for the AM station, if the disturbance occurred as 
a result of such construction or modification.
    (a) Non-directional AM stations. If tower construction or 
modification is planned within 1 kilometer (0.6 mile) of a non-
directional AM broadcast station tower, the Public Mobile Service 
licensee must notify the licensee of the AM broadcast station in advance 
of the planned construction or modification. Measurements must be made 
to determine whether the construction or modification affected the AM 
station antenna pattern. The Public Mobile Service licensee is 
responsible for the installation and continued maintenance of any 
detuning apparatus necessary to restore proper non-directional 
performance of the AM station tower.
    (b) Directional AM stations. If tower construction or modification 
is planned within 3 kilometers (1.9 miles) of a directional AM broadcast 
station array, the Public Mobile Service licensee must notify the 
licensee of the AM broadcast station in advance of the planned 
construction or modification. Measurements must be made to determine 
whether the construction or modification affected the AM station antenna 
pattern. The Public Mobile Service licensee is responsible for the 
installation and continued maintenance of any detuning apparatus 
necessary to restore proper performance of the AM station array.