Sec. 73.49  AM transmission system fencing requirements.

    Antenna towers having radio frequency potential at the base (series 
fed, folded unipole, and insulated base antennas) must be enclosed 
within effective locked fences or other enclosures. Ready access must be 
provided to each antenna tower base for meter reading and maintenance 
purposes at all times. However, individual tower fences need not be 
installed if the towers are contained within a protective property 
fence.

[ 51 FR 2707 , Jan. 21, 1986]