In this paper, we systematically investigate different factors and their effects on the wireless transmission properties using a full-factorial experimental design of a real-word wireless sensor network. We quantify the impact of primary factors such as the wireless channel, physical position, transmission power, line-of-sight, and their interactions on the wireless communication. While some of our results support conventional assumptions, this study also shows that there are many properties which are in contrast to existing findings. For example, there is no significant correlation in the measured received signal strength between different but equally-distant transmitters, yet the correlation coefficient between two transmitters is above 0.95. Further analysis reveals the strong interaction of transmission frequency and the physical position, while the transmission power and the direction of the transmissions have an isolated, non-interacting effect on the measured received signal strength. Since the analyzed network consists only of a simple, low-cost hardware, the results of this experimental analysis can serve as valuable insights in planning and deploying wireless sensor networks in different application scenarios.