Just a small correction, this would be correct order...
FX_Update_0_0_22_ByTheDarkWraith
FXU_0_0_22_Ship zon Files
OPEN HORIZONS II v2.4
R.S.D. - Reworked Submarine Damage v5.5 by vdr1981
R.S.D. v5.5 - OHII v2.4(or v2.3, it's the same file) Compatibility Patch
Dont use zon or zone.cfg files from "unit must use radio..." test mission. Everything needed for radio patches to work correctly is already contained in FXU0.0.22...OHII doesn't deal with zon files...