A stratospheric platform is a very large unmanned airship which will be an ideal base station for any kind of wireless system. But there will be a disadvantage of blocking satellite broadcasting and communication links. We have calculated the receiving level degradation and shadowed area on the ground that is dependent on the position stability of the platform and on the configuration of satellite link and platform position. And we will show an eminent reduction of the shadowing effect by choosing and adjusting the nominal platform position. Also the number of houses that remain shadowed and its unavailability due to shadowing are also shown.