From what I've heard, there was no lightning arrestor at ship's communication tower. Is there any harm on radio antenna/equipment for not installing lightning protection of about 24m height communication tower onboard ship which stationed offshore?
Also, a typical ship is ideal for installing lightning protection. You've got a good ground (the salty ocean) and you've got metal bulkheads (walls) to provide shielding (like a Faraday cage).
It would be useful to install in-line lightning arrestors in each coax coming down from the antennas. You use arrestors rated for the frequency and RF power on the line, but otherwise the tower is probably a pretty good lightning rod as it is.