## 2 Materials and Methods
### Description of Antennas and Locations  
Field measurements of the RF EMF power density and electrical field strength of a mobile telephony base station antenna were carried out at Seskines st. 2, where the KATHREIN 80010292 antenna is located. Field measurements of electrical field strength were carried out in the near-field, that is, up to 30 m distance (in both the horizontal and the vertical plane) from the antenna. Field measurements of the RF EMF power density were carried out at more than 30 m distance from the antenna. The mobile telephony base station antenna stands 14 m above the earth's surface, having the following coordinates: 54\({}^{\circ}\)42\({}^{\prime}\)45.78\" N and 25\({}^{\circ}\)15\({}^{\prime}\)0.56\" E (WGS coordinate system). First, measurements of the electrical field strength were carried out in the near-field (up to 30 m distance) on the roof in the direction of the main radiation (main lobe) from the mobile telephony base station antenna according to Figure 1. RF EMF intensity parameters were measured at different distances of 1, 5, 10, 15, 20, 25, and 30 m.  
The antenna points north-west. The azimuth of maximum radiation is 290\({}^{\circ}\). The antenna works at three frequencies (900/1800/2100): in the frequency ranges of 950-954 MHz (GSM-900 technology), 1847-1850 MHz (GSM-1800 technology), and 2137-2138 MHz (UMTS-2100 technology). The maximum effective radiated power is 1739 W, the coverage zone in the horizontal plane is 65\({}^{\circ}\)/65\({}^{\circ}\)/65\({}^{\circ}\), the coverage zone in the vertical plane is 7.5\({}^{\circ}\)/7.6\({}^{\circ}\)/6.8\({}^{\circ}\), the mechanical downtilt is 0/\({}^{\circ}\)0\({}^{\circ}\)/0\({}^{\circ}\), the electrical downtilt is \(-\)5\({}^{\circ}\)/-5\({}^{\circ}\)/-5\({}^{\circ}\), and the gain is 17.5/17.5/17 decibels isotropic (dBi). Secondly, according to the scheme in Figure 2, measurements of the RF EMF power density were carried out in the far-field area (more than 30 m distance) on the ground in the direction of the main radiation (main lobe) from the KATHREIN 80010292 mobile telephony base station antenna (the parameters of the antenna are the \begin{table}
\begin{tabular}{c c c c} \hline \hline
**EF 0392 Isotropic E-Probe** & \multicolumn{2}{c}{**SRM 3006 E Probe**} \\ \hline
**Frequency (MHz)** & **Uncertainty (dB)** & **Frequency (MHz)** & **Uncertainty (dB)** \\ \hline
0.1–300 & 0.5 & 26–400 & 1 \\
300–1000 & 1 & 400–1500 & 1 \\
1000–3000 & 0.5 & 1500–3000 & 1 \\ \hline \multicolumn{4}{c}{**Manufacture Data Sheet**} \\ \hline Flatness of frequency response & 1 & Flatness of frequency response & \\ (Calibration uncertainty not included) & (Calibration uncertainty not included) & 1 \\ Linearity & 1.5 & Linearity & 2 \\ Isotropic response & 1 & Isotropic response & 1 \\ Temperature response & 0.5 & Temperature response & 0.5 \\ \hline \hline \end{tabular}
\end{table} 
Table 2: Uncertainties of probes and devices. same). The RF EMR measurement points were located at intervals of 10 m: the first measurement point was on the ground 30 m from the antenna's vertical axis, the second at 40 m, and so on up to 500 m.  
Measurement locations were selected in the road, field, or car park. The azimuth of all measurement points was 290\({}^{\circ}\). According to the scheme shown in Figure 3, the field measurements of the RF EMF power density were carried out on every floor of the 10-storey building. The direction of the main radiation (main lobe) from the KATHIREIN 742241 antenna was towards the 10-storey building. Measurements of the RF EMF strength were not carried out due to the distance between the measurement points and  
Figure 1: Scheme of the electric field strength of the mobile telephony base station antenna (1739 W ERP) on the roof. Figure 2: Measurement scheme of electromagnetic power density of the mobile telephony base station antenna (ERP = 1739 W).