Hi Mike, so isnt using an unshielded cable leaving it open to EMI? My router is not grounded, btw.
I’ve never used shielded ethernet cables and I’ve never experienced EMI/RFI on my LAN or ethernet-connected devices.
I believe you can’t just use shielded cables and call it a day. The connected devices need to support using shielded cables, and you can’t mix with non-shielded cables. I may remember that a bit wrong, so happy to be corrected.
Just don’t use shielded cables and you’ll be fine.

