Sec. 101.149  Special requirements for operation in the band 38,600-
          40,000 MHz

    Assigned frequency channels in the band 38,600-40,000 MHz may be 
subdivided and used anywhere in the authorized service area, subject to 
the following terms and conditions:
    (a) No interference may be caused to a previously existing station 
operating in another authorized service area;
    (b) Each operating station must have posted a copy of the service 
area authorization; and
    (c) The antenna structure height employed at any location may not 
exceed the criteria set forth in Sec. 17.7 of this chapter unless, in 
each instance, authorization for use of a specific maximum antenna 
structure for each location has been obtained from the FAA prior to the 
erection of the antenna.