With little error, taking assumption of sinusoidal current distribution on the half‐wave dipole for exact (near and far) field and using the geometrical optics (GO) theory for ground reflection, a simplified yet improved method is derived for calculating site attenuation in terms of the antenna factors of transmitting and receiving antennas. The near field and mutual coupling problems that have caused errors between theoretical and measured data in the past can be easily solved. The deviation in the site attenuation curve due to equipment impedance mismatch and dissipative losses is also discussed. The results obtained by using this method show a good agreement with those obtained by Kawana using the moment method (MM) (for 3 meter site) and those measured by the National Bureau of Standards of U. S. A. (NBS) (for 3, 10 and 30 meter sites), while much more calculating time is saved. That is, this method provides a more effective solution for evaluating theoretical site attenuation of a standard open site.