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In the ISM band multiple wireless technologies compete for a limited amount of spectrum, leading to interference and performance degradation. Reliable information on the spectrum occupation enables more optimal usage and can improve co-existence in the ISM band. In this paper, we study the robustness of the information obtained about the propagation environment when sensing with multiple, heterogeneous devices, at multiple diverse locations. More specifically, we look into the impact on the path loss estimation depending on the type, number and the location of the sensing devices. The analysis in this paper is done based on indoor measurements in the ISM band. Based on the presented measurements and analysis we conclude that analysis based on only one device type or in specific locations can lead to suboptimal or even incorrect estimation results.