By 'properly used' I mean not dragging it on the bottom and having it far from surface. Usually good approach is 'deploy as much is it is possible (without dragging it on the bottom).
In stock DW, VLAD has best range. About 7nm. With LWAMI VLAD can't be used that much because it has modified depths.
DIFFAR has better range than DICCAS in both variants. DICCAS is little penalized in range against DIFFAR because of active mode.
Can't tell about HELOs MAD range. And you can't control helo's altitude anyway.
I've never seen MAD working no FFG's helos. I would not know. Helo just promotes the contact to the link. It does not say how the helo did find out.
But sometimes it gives the contact to link so soon, that it must have been MAD. Especially in quick missions with FFG some sub is close to the FFG (under 1nm). Then you just order helo to launch and in the moment it takes off there is sub on the link.
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