A rack has a first shelf and a second shelf disposed upwardly of said first shelf, and a display unit is placed on the first shelf and disposed between the first shelf and the second shelf. A chamber for slidably housing a piston extends along an axis inside the cylinder body. A device is associated with the network connection that detects and analyzes the signals being exchanged. The system includes a controller external to the string of devices and a bi-directional connection lines connecting each device in the string to an upstream andor downstream device in the string. The apex of this cone that serves as its feed point has a base diameter that results in the wide bandwidth, with the monocone antenna having a 5 dBi gain and omnidirectional coverage. 1-5% by weight at a temperature of 20\xb0 C.