In my experience it’s the last meter or so that makes the difference as my guess it’s using a cable that is insulated/shielded better reducing EM/RFI before getting to the streamer with an improvement in lower noise floor. Simple and affordable test is buy a Supra Cat 8 cable and connect between your 70ft run to your streamer. If the end of your existing run does not go to a wall plate first, being plugged directly to your streamer, then just use a coupling to connect the two cables.
To upgrade, or not to upgrade, that is the question
After reading the comments on ethernet cables, I am curious to what y'all would say about this setup, and should I try to improve it. My streamer is a 70 foot run to the modem/router and I am using basic best buy ethernet cable through a floor and 2 walls. SQ is pretty good from Qobuz. What if anything could be an improvement?