nomorecomcast
I am not able to answer your last PM because it says your folder is full.
It is not worth your trouble to build a yagi for hunting power line noise if you don't have a receiver to connect it to. Here are some links about that:
http://www.homingin.com/equipment.html
http://theleggios.net/wb2hol/projects/rdf/tape_bm.htm
http://www.arrl.org/files/file/Technology/HANDSON.pdf
But, I think it is worth the trouble to build a channel 2 or channel 6 yagi to see if they will make the signals stronger compared to the power line noise.