A terrestrial radio link faces a great deal of obstacles in a path: Hence, the electromagnetic wave cannot travel great distances, while a satellite link features an extremely long transmission path, which weakens the wave and demands additional cost, although less obstacles obstruct the signal. Thus, the current focus is on the use of an undeveloped space, the stratosphere that is located between the terrestrial and the satellite domains. The idea has existed for some time of an airship, a balloon, or the like which would be kept in the stratosphere, where the airstream is relatively steady and used for telecommunication systems relay purposes [2]. On the other hand, the demand for an economical “broadband” wireless access system is increasing, due to rapid popularization of mobile communication (such as mobile phones) and internet. It is expected that the stratospheric platform may be the infrastructure that will allow these services to be offered economically to business users as well as personal users [2], [3], [4] and [5].