I have the Samsung Propel A767 and i have a antenna booster sticker and i dont get good signal in school so where is the best place to put it at in the battery compartment? The very top very bottom center it to the left to the right? i need it to at least give me 1 or 2 bars in school. or is it better to put it on the battery near to copper contacts on the battery. please tell me where the best place to put it is. thanks