The ANC-4 is not a cure-all for power line noise. It is only effective if the
noise can be isolated from the receive signal, and brought into the unit on a
separate "sense" antenna. It is not set and forget if the phase of the noise
changes over time. At my particular QTH, the line noise originates all over
the neighborhood, at numerous poles, and as weather and temp changes, the
sources of noise change. The ANC-4 is completely ineffective against this
noise. As a matter of fact, I'm selling mine on EBay as soon as I can get a
picture of it. I'm not saying it doesn't work - it just is effective against a
specific kind of noise source, like a dimmer or computer.
-Wiley KF6IIU
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