Mike, talking about LRL with rods, you have to think diferent. It is a known problem for decades, with several names and also several approaches to solve it.
In a LRL with rod's, the problem is the "human receiver" : very unreliable.
If you manage to change the sensitivity of the user/receiver, then you will see that the signal line between generator and target, will also change.
Humans responde to the rate of change, rather to the absolute maximum value of this strange field.
Note that the dynamic range differs from user to user, as also the minimum/ maximum rate of change, that a human receiver can see.
So, in the case of an "old" massive target, we talking about an endlles chaos of local minima/maxima at wich usually a human receiver respond.
There are some (partially) solutions wich work well enough, if you deal will relative small /medium targets.
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