With the improved cost and performance of WLAN systems and the growing availability of standard-based solutions, wireless LAN services and acceptance have mushroomed in both the research and application domains. In the technology world, most of the concerns are about security and quality of service of WLANs. This paper reports some results of the most comprehensive longitudinal WLAN site survey study conducted in Hong Kong during 2002-2005. The discovery of the stop and kill packet are gingerly reported in this paper. Further direction for research is also discussed