The present invention relates to microspheres having a high index of refraction. A periphery of the retaining box has a plurality of through holes. The body also has a hollow interior extending between the first end and the second end. In the specific examples the antenna could be a folded monopole, a folded dipole, a loop, or other type of differential antennas. The bracket includes a pair of spaced apart mounting devices, wherein the mounting devices are sized and shaped to protrude through the pair of corresponding spaced apart holes in the plurality of electrical junction boxes. Alternately, loss of signal, loss of lock, out of band, and run length alarm conditions may be detected.