A method and apparatus for coupling to a common line in an array. Preferably the chill face on a chill block is substantially equidistant from the chill face of the corresponding chill block defining the respective section of the vent chamber. In other words, the ovonic threshold switch may be formed of a chalcogenide layer which extends, uninterrupted, over numerous cells of a phase change memory. Loose flaps of material on the multi-layered element are acted upon by the wind as the vehicle travels, simulating the movement of the depicted figure. The crown portion extends rearward from the face portion over the aft-mass portion. A database of the antenna gain and deployment patterns of the actual antennae in the system is used to normalize the data.