4Game

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These % aren't additive, but multiplicative.

Concealment is not reduced by absolute -10%, but the 10% relative to the opponent's tank concealment. Similarly -15% applies to relative bush concealment.

Having Comm's VS against moving…

• EBR with 50% concealment becomes: 50% * (1 – 0.1) = 45%, i.e. 5% absolute concealment reduction, not 10% as the docs confusingly suggest.
  With view range 439m: (439m – 50m) * (1 – 0.45) + 50m = 264m, not 283.4m.
• Med Tank with 25% concealment: 25% * 0.9 = 22.5%, i.e. 2.5% absolute, not 10%.
  With view range 439m: (439m – 50m) * (1 – 0.225) + 50m = 351m, not 380.65m.

Similarly with the foliage concealment, assume a moving enemy hides behind a bush that gives an extra +50%…

• 50% concealed EBR becomes: 50% * (1-0.15) + 50% * (1 – 0.1) = 87.5%, i.e. 12.5% absolute concealment reduction (not 25%).
  With view range 439m: (439m – 50m) * (1 – 0.875) + 50m = 99m
• 25% concealed Med Tank: 50% * 0.85 + 25% * 0.9 = 65%, i.e. 10% absolute (not 25%)
  With view range 439m: (439m – 50m) * (1 – 0.65) + 50m = 186m

Comparing it to Optics

This is also relative view range

Optics is also relative (multiplicative), but it's easier to digest. It applies to the view range of your vehicle. Say, your tank has 439m view range

You'll see a 50% concealed moving EBR in

• With no equipment: (439m – 50m) * (1 – 0.5) + 50m = 245m
• With Optics: (439m*1.1 – 50m) * (1 – 0.5) + 50m = 267m
• With Comm's VS: (439m – 50m) * (1 – 0.45) + 50m = 264m

You'll see a 25% concealed moving MT in

• With no equipment: (439m – 50m) * (1 – 0.25) + 50m = 342m
• With Optics: (439m*1.1 – 50m) * (1 – 0.25) + 50m = 375m
• With Comm's VS: (439m – 50m) * (1 – 0.225) + 50m = 351m

Summary

Thus, this equipment is 2x – 10x less useful than many would expect reading the equipment description. It's main use is to counter well concealed LTs like EBRs and ELC-90, especially on Prokhorovka (top alley bushes) or Ghost Town (valley bushes). Other usecases diminish the return comparing to, say Optics. If you can get a trophy or a bonned Optics, the difference is even bigger.

Look at the computation below, d(Opt / CVS) in meters tells you when Comms SV is better than Optics.

Against average MT (25% standing / 19% moving)

Against an hidden LT (42% concealment)

Thanks to Barabekus testing for the idea and providing real life test numbers to confirm the formulas above. Also the comments under that video clarifying the discussed topic.
Note: looks like there is a typo in his vid, with Optics an enemy MT behind the bushes should have different final concealment when moving vs while stationary.