Sec. 73.160  Vertical plane radiation characteristics, f(, 
is 0 degrees in the horizontal plane, and 90 degrees when perpendicular 
to the horizontal plane. The vertical plane radiation characteristic is 
referred to as f(.
    E(O) is the radiation from the tower in the horizontal plane.

    (b) Listed below are formulas for f( is the difference between H and A; H-A.

    See Figure 2 of this section.

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    (c) One of the above f(=115 
electrical degrees (235-120):

                                                                        
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                         46 FR 11993 , Feb. 12, 1981]