A system, method and apparatus for wireless communications are provided. A handle substrate is then contacted to an exposed surface of the stress inducing material layer. Thus, the mobile radar system described herein provides for longer time on target and longer integration times, increased radar sensitivity and improved Doppler resolution and clutter rejection. Operational efficiencies can also be improved by calculating site-specific Degree-days and K-factors for each tank and by taking historical propane usage for each tank, weather conditions, and projected fuel usage into account. Furthermore, by increasing the thickness of the window layer, the probability of defect generation can be reduced. Between the input circuit and the transformer, a lowpass filter is interposed.