Visual spotting of subs is only modeled in the latest (still beta, correct me if I'm wrong) LWAMI.
Masts are not detectable with radar in DW.
Masts only increase the noise, both BB and NB. It only should affect BB, but in DW all noises just increase complete emitted sound level, so the change is visible on NB too.
Anyway, masts gives just little noise. It will mostly affect your sensors (which is easy to notice).
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