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