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In this poster we describe and detail a real life application of a wireless sensor network, using a new mesh topology model. This network model leads to a reliability improvement caused by the spatial diversity of the propagation paths - the reception of multiple packetspsila copies over many paths, some of them possibly faded or disrupted. To prove the inherently coordination-free capability, the poster describes the deployment and the operation of the network by personnel who was not trained for the task and the short (less than a day) deployment time. The main discussion is about the architecture of the system and the field test results, as they lead to a high probability that changes in the site are inherently handled by the system without human intervention. The model, evaluations and results reported concern a commercial pilot of 100 nodes, conducted by the Israel Electric Company in a dense urban area and fully operational since its deployment.