A calibration apparatus and method for controlling the phase and amplitude of a signal in a smart antenna multicarrier communication system are provided. The handle assembly includes a trigger, a housing having a distal aperture formed in a distal end of the housing, a button disposed on a top surface of the housing, and a biasing member in communication with the button. A side surface of the transparent plate is formed to have a taper widened upwardly and corresponding to the draft. A tie-bar extends between the two braces.