Antenna Field Strength Calculator
Calculate electric field strength at a given distance from a transmitting antenna. This tool uses standard formulas for common antenna types in far-field conditions.
Enter transmit power and distance to instantly calculate the electric field strength in mV/m. The calculator supports isotropic radiators, half-wave dipoles, quarter-wave monopoles, and full-wave dipoles.
Electric Field Strength:
- mV/m
-
Example Coverage Scenarios:
- 100 W half-wave dipole @ 5 km = 14.0 mV/m (VHF Broadcast)
- 1 kW quarter-wave @ 2 km = 158.0 mV/m (AM Radio Station)
- 50 W isotropic @ 2 km = 19.4 mV/m (Mobile Base Station)
- 10 kW half-wave @ 20 km = 34.9 mV/m (FM Broadcast)
- 5 W quarter-wave @ 0.5 km = 44.7 mV/m (Walkie-Talkie)
This tool helps with:
Planning radio coverage and transmitter range for EMC testing
Calculating expected field strength at test distances
Comparing antenna directivity effects on field strength
Link budget calculations for wireless device testing
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Last updated on January 13, 2026 by IBL-Editors Team
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