Sec. 90.305  Location of stations.

    (a) The transmitter site(s) for base station(s), including mobile 
relay stations, shall be located not more than 80 km. (50 mi.) from the 
geographic center of the urbanized area listed in Sec. 90.303.
    (b) Mobile units shall be operated within 48 km. (30 mi.) of their 
associated base station or stations. Such units may not be operated 
aboard aircraft in flight except as provided for in Sec. 90.315(i).

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    (c) Control stations must be located within the area of operation of 
the mobile units.
    (d) Base and control stations shall be located a minimum of 1.6 km. 
(1 mi.) from local television stations operating on UHF TV channels 
separated by 2, 3, 4, 5, 7, and 8 TV channels from the television 
channel in which the base station will operate.