[RFI] How to proceed?

[N4ZR]

Recently, I have experienced constant S8 line noise on 160 meters.  I've 
killed the power in my house and run the radio on batteries, with no 
change, so it's nothing inside.  When I drive down the road a couple 
hundred yards away, which has a 3-phase powerline on one side, with my 
car radio tuned to 1710 KHz, the noise is almost deafening, with 
definite peaks at certain poles, as well as intermittent snapping and 
crackling noises that really suggest something loose or broken..  
However, today I went out with my homebrew VHF aircraft band Moxon, 
hoping to narrow down the noise-maker(s) to particular poles, and to my 
surprise I could not hear anything comparable to what I heard at 1.7 MHz.

Any suggestions about how I might go about tracking down the source or 
sources?  The local power company guy is very willing, but does not have 
much training to go on.

-- 
73, Pete N4ZR
Check out the Reverse Beacon Network
at <http://reversebeacon.net>, now
spotting RTTY activity worldwide.
For spots, please use your favorite
"retail" DX cluster.