From the mod's files it appear that this device needs to go into a slot called ... RadarWarningReceiver
Looking for that slot, it appears in the modded versions of all US subs except the Balao.
If you are playing the Balao class, then you wont be able to use it, unless you mod the needed files, which you can do.
For all the other sub's it appears to be compatible in Weapon Slot 7, which is traditionally a deck gun slot. So try that slot in the upgrade screen.
If the designers were slick, they would make sure you could not get this addition untill your boat was able to carry two deck guns, so at least an additional slot opened up. But I havent dug that deep to confirm.
In any case, "CounterMeasure" sounds cool, but in reality it is nothing more than a warning that a radar beam has reflected off your boat. sort of like when you hear a sonar ping. You now know someone is about to get a better picture of you.
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