The standard "Protection Fields" module grants +3 defense against any of the three weapons types to nearby ships. Additional standard modules require adding to each specific defense type one at time. The included modules allow continuing to add to all types simultaneously.
(Note that the AI will have access to these modules as well.)

*** REQUIRES v1.1 or later of Galactic Civilizations II ****

To install: Place the included file in your “My Documents\My Games\GalCiv2\Mods\Data\StarbaseModules” directory.

Protection Fields II:
(Requires: Protection Fields)
Defense Assist (All Categories) +3
Cost: 0

Protection Fields III:
(Requires: Protection Fields II)
Defense Assist (All Categories) +4
Cost: 0

Protection Fields IV:
(Requires: Protection Fields III, Starbase Fortification)
Defense Assist (All Categories) +6
Cost: 300

Protection Fields V:
(Requires: Protection Fields IV, Starbase Fortification Mark II)
Defense Assist (All Categories) +8
Cost: 300

Protection Fields VI:
(Requires: Protection Fields V, Starbase Fortification Mark III)
Defense Assist (All Categories) +10
Cost: 300