We used the spectrum analyzer with logarithmic – periodic antenna and we adjusted the parameters of spectrum. The purpose of the measurements is to detect whether there are cellular mobile antennas in the particular at the 19th Elementary School of Kavala that is of interest to the health due to this point have everyday a lot of children. The frequencies we analyzed were GSM-1800 and GSM-900. The specific frequencies were measured, analyzed in four points of interest and in three directions for finding signals of the mobile antennas in the broader area. Cellular mobile antenna signals were detected in specific areas calculated and analyzed the summary of the electromagnetic field strength.