1. "FSPXA350900_Amtennas.bmp" must be saved as "DXT1" format only with alpha map of "Antennas_Alpha.bmp".
Other format bmp cannnot be shown with correct alpha channel transparency in FS9.
2. If your repaint is for FS9, you can erase all antenna's parts from FSPXA350900_T. Those are available for FSX repaint only.