## 4 Test Environments
In the 6 GHz band, the spectrogram remains uniformly blue, highlighting negligible activity. This aligns with the fact that 6 GHz Wi-Fi technology is still emerging and not widely adopted in residential settings. Notably, this residential environment corresponds to a less densely populated area, more isolated than typical urban residential zones, which contributes to the overall lower spectral activity observed. In contrast, the laboratory environment shows a substantial increase in spectral activity, especially in the 2.4 GHz and 5 GHz bands. The 2.4 GHz spectrogram displays green, yellow, and occasional red regions, signifying moderate to high levels of interference and active transmissions. This reflects the dense deployment of legacy Wi-Fi systems in laboratory environments, where multiple devices often operate simultaneously. The 5 GHz band also exhibits significant activity, with visible signal peaks indicating higher utilisation compared to the residential setting. This is likely due to the preference for 5 GHz Wi-Fi in laboratories to reduce interference and support higher data rates. However, the 6 GHz band shows minimal activity, with mostly blue regions and a few isolated peaks. This suggests limited use, likely for experimental purposes or controlled testing of next-generation Wi-Fi equipment. The industrial environment exhibits the highest levels of spectrum saturation, particularly in the 2.4 GHz band. The spectrogram for this band is dominated by green, yellow, and red regions, indicating intense interference and congestion. This is consistent with the high usage of the 2.4 GHz band in industrial settings, where legacy Wi-Fi systems and other communication technologies coexist. The 5 GHz band shows moderate activity, with visible signal peaks that suggest active transmissions but less interference compared to the 2.4 GHz band. However, the 6 GHz band remains largely unused, with a predominantly blue spectrum and only minor peaks. This indicates that 6 GHz Wi-Fi technology has yet to see significant adoption in industrial environments, likely due to its recent introduction and the high cost of upgrading existing systems. These observations highlight the clear differences in spectrum utilisation across the three environments. The 2.4 GHz band consistently exhibits the highest levels of activity, particularly in industrial and laboratory settings, due to its widespread adoption and compatibility with legacy systems. The 5 GHz band shows moderate to high utilisation in environments where reduced interference and higher data rates are critical, such as laboratories and industrial zones. In contrast, the 6 GHz band remains largely unused across all environments, reflecting its nascent stage of adoption. This analysis underscores the impact of deployment scenarios on spectrum use and interference levels, providing valuable insights into the performance of IEEE 802.11 technologies in diverse real-world conditions. The numerical summary of this analysis is presented in Table 4, illustrating the spectrum occupancy for each environment. Nevertheless, it is crucial to acknowledge that these findings are indicative of specific moments and may be influenced by dynamic factors, such as the movement of obstacles and interference from other networks, which continuously modify the spectrum in real time.