Fresh hacks every day
I used shielded and properly grounded cat6, and even then I was seeing spurs and noise all over from 2m down. Granted the cat6 run was basically parallel to my attic antenna just about 5 ft from it for nearly the entire length.
I put one ferrite ring on both ends of the run with 5 turns through each and nearly entirely killed spurs I had been seeing all over the spectrum.
Are you running 100M ethernet? It creates large spurs every 61 kHz all the way up into UHF. I've gotten rid of almost all of my 100M equipment because of the RFI. I've just got a couple of things left to replace and 2 meters will be nice and quiet.
I think it may be. Its specifically just a run for IP camera so it may be negotiating at 100Mbps
Unfortunately, most IP cameras are 100M. Some of the cheaper ones have bad ethernet transformers and produce even more RFI than they should.