## 1 Introduction  
Base stations serve a limited number of users in a localized geographical area. As users demand more multimedia applications that require high data rates, the number of base stations increases. Each base station utilizes a specific communication technology, such as GSM (Global System for Mobile Communications), UMTS (Universal Mobile Telecommunications System), or LTE (Long Term Evolution). The coverage area for base stations using GSM technology is relatively large (e.g., 10 km), but it is much smaller for LTE base stations (e.g., 1 km). Compared to GSM base stations, many more LTE base stations need to be installed in order to serve the same coverage area [1]. As the LTE system supports high data rate applications, the number of LTE base stations around us is rapidly increasing to meet the growing demand of users. Because each base station establishes a connection with users in its coverage area through electromagnetic waves, the increasing number of base stations also increases the amount of electromagnetic fields they emit. Hence, measuring and evaluating the radio frequency electromagnetic field (RF-EMF) values emitted by base stations is crucial to protect human beings from potential harmful effects. For instance, [2] classified RF-EMF as possibly carcinogenic to humans. In [3], it was indicated that electromagnetic fields pose health risks that extend beyond cancer, including conditions like electromagnetic hypersensitivity. In [4], it was shown that low-level EMF at 2.45 GHz causes an increase in inflammation, testicular damage, and has a negative impact on male reproductive system function. The work of [5] indicated that oxidative stress induced by RF-EMF can lead to DNA damage in neurons, while [6] suggested that higher brain exposure to RF-EMF is related to lower non-verbal intelligence but not to other cognitive function outcomes. As indicated in [7], to estimate the risk for human health by RF-EMF exposure experimental studies in humans and epidemiological studies still need to be considered. Many international organizations, such as the World Health Organization (WHO), the International Commission on Non-Ionizing Radiation Protection (ICNIRP), the Institute of Electrical and Electronics Engineers (IEEE), and the Federal Communications Commission (FCC), study the potential effects of electromagnetic fields on human health. Each country has its own limit values for exposure to electromagnetic fields. In Turkey, the Information and Communication Technologies Authority (ICTA) is authorized to set limit values, and it adopts 70% of the limit values determined by ICNIRP. Table 1 shows the limit values for the total electric field strength (E) of the environment between 10 kHz-94,000 MHz, as determined by the ICNIRP [8] and the ICTA [9]. For example, the ICNIRP limit value for base stations using the 900 MHz frequency is 41.25 V/m, whereas ICTA's limit value is 28.80 V/m. Similarly, for base stations using the 2100-MHz frequency for 3G, the ICNIRP's limit value is 61 V/m, and the ICTA's limit value is 42.93 V/m. The limit values for 4G base stations using the 2600 MHz frequency band are also 61 V/m and 42.93 V/m for the ICNIRP and the ICTA, respectively. Studies on the measurement and evaluation of RF-EMF levels from a base station mainly focus on short-term, long-term, and band-selective RF-EMF measurements. Studies [10; 11; 12; 13; 14] evaluate the short term, [15; 16; 17; 18] assess long-term, and [19; 20; 21] provide short-term, band-selective RF-EMF measurement results for different mediums. Short-term RF-EMF measurements may not always be sufficient for evaluating the levels in an environment. Since RF-EMF values can vary throughout the day, recorded values may differ depending on the measurement time. Therefore, at least one daily RF-EMF dataset is necessary to analyze levels in an environment. Long-term RF-EMF measurements, other than one day, are of great importance for modeling and analyzing variations.