Summary of Harmonic Shields levels:
I- in rulebook; bases only.
II- in rulebook; ships; same cost.
III- better red hex performance; same cost.
IV- see below.
This enhanced version of Harmonic Shields applies to X fighters (but is still required if you want higher levels of the tech, even if you don't have X fighters).
Add new rule:
(T5.150) Allows X FTRS to operate in Radiation and Red space. It costs 50% of the FTR's BPV to install HS-IV on them. You must have all previous levels of harmonic shields tech. It can be refitted on existing XFTRs at a rate of 24xFTRS/turn and paying the 50% cost (the refit can be done on anywhere, as long as the fighters are in supply; a shipyard or large military base isn't required). In effect the XFTRs no longer have their BPV halved for build cost. Fighters with this tech installed have a "#" suffix (example: Stinger-X# / St-X#).
Example: The Stinger-X has BPV of 14 and an EPV of 7. With HS-IV installed, they cost 14 EPV to build.
This tech is only available after a successful R&D program (D1.0).