Sectorized antennas provide an attractive solution to increase wireless network capacity through higher spatial reuse. Despite their increasing popularity, the real-world performance characteristics of such antennas in dense wireless mesh networks are not well understood. In this demo, we demonstrate our multi-sector antenna prototypes and their performance through video streaming over an indoor wireless network in the presence of interfering nodes. We use our graphical tool to vary the sender, receiver, and interferer antenna configurations and the resulting performance is directly visible in the video quality displayed at the receiver. Categories and Subject Descriptors C.4 [Performance of Systems]: Measurement Techniques; C.2.1 [Network Architecture and Design]: Wireless Communication--Dense Wireless Mesh Networks General Terms Experimentation, Measurement, Performance Keywords Sectorized Antenna, Dense Wireless Mesh Networks, Sector Selection, Directional Hidden Terminal Problem