[RFI] Unusual subharmonic RFI

[dalej]

This probably doesn’t relate to this, but I found a weird signal encompassing the 75 meter band and different places, some places were blanking out several Kc's.  I found it to be from a local broadcast station about 3 miles from my location, 10KW.  To make a long story short, I found that my ground cable from the tower to the ground rod was causing rectification, making the tower itself an antenna picking up the broadcast signal all up and down the 75 meter band.  Once I isolated that copper cable using stainless brackets from the tower legs the junk was gone.  Sometimes the simple things (duh) just don’t make it.  

Dale j.