I fabricated a bracket to mount the ELT antenna; it will bolt to the stringers with 4 each 6-32 screws and nuts. It only has to withstand 12.5 lbs of force of longitudinal axis force without deformation, and I'll test it once it's done. Similarly, there will be a strip of aluminum to mount the COM/GPS/XM antenna, for which I've added an additional stringer standoff, and I drilled the standoffs in the region of aluminum strip, which will provide the support for the strip.
