Pete,
With the antennas you have I don't think you are going to gain much more
information about the location of the noise source(s) than you have
gained already. If you could arrange to rotate the loop you might get a
more accurate azimuth bearing on the predominant noise source. However
since most of the interference sources are connected to the power grid
(or ARE the power grid) they tend not to appear as "point sources" but
rather radiate from the miles of power grid, being slightly stronger
closer to the place where the arcing or other noise generation action is
occuring. Since the power grid is a much less efficient transmission
line at higher frequencies, the noise source will act more and more like
a point source as you listen to it at higher frequencies. And you can
make portable antenna with a real good directional pattern at higher
frequencies too. So, it is common practice (even though 160 meters is
what you are interested in) to use a portable VHF AM receiver and a two
or three element yagi to DF on the noise source. Finding a VHF receiver
that functions in AM mode used to be difficult. Almost the only options
were VHF air band handhelds, which had not other purpose for you, and
really expensive all mode scanners. These days though, you can buy a two
meter or multiband handheld that has AM receive function too.
Good luck, DE N6KB
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