ARRL

Table 9.2

Table 9.2--Typical RF Field Strengths Near Amateur Radio Antennas

A sampling of values as measured by the Federal Communications Commission and Environmental Protection Agency, 1990

Antenna Type        Freq    Power   E       Location         
                                    Field                    

                    (MHz)   (W)     (V/m)                    

Dipole in attic     14.15   100     7-100   In home
          
Discone in attic    146.5   250     10-27   In home          

Half sloper         21.5    1000    50      1 m from base    

Dipole at 7-13 ft   7.14    120     8-150   1-2 m from       
                                            earth            

Vertical            3.8     800     180     0.5 m from base  

5-element Yagi at   21.2    1000    10-20   In shack         
   60 ft                                                        
                                    14      12 m from base   

3-element Yagi at   28.5    425     8-12    12 m from base   
   25 ft                                                        

Inverted V at       7.23    1400    5-27    Below antenna    
   22-46 ft                                                     

Vertical on roof    14.11   140     6-9     In house         

                                    35-100  At antenna       
                                            tuner            

Whip on auto roof   146.5   100     22-75   2 m from         
                                            antenna          

                                    15-30   In vehicle       

                                    90      Rear seat        

5-element Yagi at   50.1    500     37-50   10 m from        
   20 ft                                    antenna

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