## 2 Materials and Methods
### Description of Antennas and Locations
antenna, which was more than 30 m. The distance between the building and the antenna was 35 m. The antenna worked at three frequencies (900/1800/2100): in the frequency ranges of 951-953 MHz (GSM-900 technology), 1836-1840 MHz (GSM-1800 technology), and 2137-2138 MHz (UMTS-2100 technology). The effective radiated power was 1428 W, the coverage zone in the horizontal plane was \(65^{\circ}/65^{\circ}/65^{\circ}\), the coverage zone in the vertical plane was \(7.5^{\circ}/7.8^{\circ}/7.3^{\circ}\), the mechanical downtilt was \(0/^{\circ}0^{\circ}/0^{\circ}\), the electrical downtilt was \(-4^{\circ}/-4^{\circ}/-4^{\circ}\), and the gain was \(17/16.8/17\) dBi. The antenna was mounted on a 10-storey building. The antenna's pole height was 9.5 m and its length was 2 m. The azimuth of all measurement points was 250\({}^{\circ}\) and the corresponding coordinates were \(54^{\circ}44^{\prime}31.15\"\) N and \(25^{\circ}16^{\prime}15.56\"\) E.  
According to the scheme shown in Figure 4, measurements of the RF EMF power density were carried out on the ground in the direction of the main radiation (main lobe) from the KATHREIN 742241 antenna. The antenna works at three frequencies: in the frequency ranges of 950-954 MHz (GSM-900 technology), 1836-1847 MHz (GSM-1800 technology), and 2137-2138 MHz (UMTS-2100 technology). The effective radiated power was 1328 W, the coverage zone in the horizontal plane was \(65^{\circ}/65^{\circ}/65^{\circ}\), the coverage zone in the vertical plane was \(7.5^{\circ}/7.8^{\circ}/7.3^{\circ}\), the mechanical downtilt was \(0/^{\circ}0^{\circ}/0^{\circ}\), the electrical downtilt was \(-1^{\circ}/-2^{\circ}/-2^{\circ}\), and the gain was \(17/168/17\) dBi. The antenna was located on a 30 m high public building. The length of the antenna was 2 m. RF EMR measurement points were located at intervals of 10 m: the first measurement point was on the ground at a distance of 10 m from the antenna's vertical axis, the second at 20 m, and so on up to 500 m. The locations of measurements were selected in the road, field, or car park. The azimuth of the measurements was \(150^{\circ}\). RF EMF power density measurements were carried out on the ground in the direction of the main radiation (main lobe) from the KATHREIN 742266 antenna. The antenna works at two frequencies: in the frequency ranges of 944-958 MHz (GSM-900 technology) and 2122-2123 MHz (UMTS-2100 technology). The total effective radiated power was 707 W, the coverage zone in the horizontal plane was \(65^{\circ}/68^{\circ}\), the coverage zone in the vertical plane was \(7.5^{\circ}/5^{\circ}\), the mechanical downtilt was \(0/^{\circ}0^{\circ}\), the electrical downtilt was \(-4^{\circ}/-4^{\circ}\), and the gain was \(16.5/17.8\) dBi. The antenna was located on a 30 m high building. The antenna's pole height was 2 m and its length was 2.6 m. RF EMR measurement points were located at intervals of 10 m: the first measurement point was on the ground at a distance of 10 m from the antenna's vertical axis, the second at 20 m, and so on up to 500 m. The azimuth of measurements was \(170^{\circ}\). Figure 3: Measurement scheme of electromagnetic power density of the mobile telephony base station antenna (ERP = 1428 W). Measurements of the electric field strength were also carried out in the near-field (up to a distance of 7 m) on the roof (the measurement location's height was 30 m and its address was Sauletekio st. 11) in the direction of the main radiation (main lobe) from the KATHREIN 742241 antenna according to Figure 5.  
A detailed possible anchorage (supporting the antenna on the roof) designed to withstand a characteristic wind speed of, for example, 100 km/h is presented. The antenna is fixed upright on the mast, and, by means of the fastening system, has a limited possibility of automatic adjustment through a crank angle between 0\({}^{\circ}\) to 10\({}^{\circ}\). To fix the mast (with a diameter of less than 70 mm), the bearing support shown in Figure 6 can be used.