looking for 80 dB isolation, both antennas are 15 cm apart & mounted on shell body (flushed with shell surface)
80 dB is a hell of isolation. Even if they operate in different frequencies its hard to keep it that far apart (15 cm seems too close for me, but it depends on which frequency range youre talking about). My hint would be trying Circular polarization (if possible), one's left the other is right.
As Marcelo said, 80 dB isolation is a really high value. However, the antennas are separated 15 cm, which is equivalent to several wavelengths (depending on the frequency of operation). You can decouple antennas, among other methods, by using metamaterial/AMC/EBG spacers or by using microwave hybrids. Further information about the type of antennas and the surface where they are mounted would be required to provide a proper solution.
Time division halfduplex techniques may provide isolation you are aiming at.
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