Below are some screen shots of Ethernet induced RFI in the 20 meter band. This is AFTER I have put some toroids (Type 31 material, 3-4 turns) on several ethernet wires in my house.
This first picture is taken with my beam pointed toward the house (about 50 feet away)
This second picture is with the beam pointed away from the house. You can see the difference in signal strength (I touched up my tuner a little for the previous picture, thus the increase in baseline signal):
This third picture shows the signal strength when the beam is pointed 90 degrees away from the house, but directly at a WiFi Tower (100 feet from beam)-- I live in the country, and I get my high speed internet from a local wifi company. I provided the tower for them to put their repeated on. Notice the one signal which is strongest.(Third from the left) This is the line from the WiFi tower to my house to provide my internet service.
Just for comparison, here is a screen dump of the signals from my 160 meter loop, approximately 50 to 150 feet away from the house:
This next picture shows the signals with no antenna connected. Notice that the only signal showing must be coming from inside the house and close to the radio itself.
Below I will add additional pictures as I work on eliminating the RFI: