Hi Tony
I use a 7.5m MeiCord Opal ethernet cable from my router to streamer.
It is an excellent cable and has topped a lot of reviews regarding sound quality. You can get it in various lengths (mine cost £100 from MCRU).
I also replaced the SMPS on my router with a low noise linear power supply and I have also "grounded" the router via a USB socket, to an Entreq Silver Minimus grounding box.
These accessories, coupled with the use of a quality ethernet cable, reduce spurious RFI/EMI and noise to maximise the streaming experience.
Well worth investigating IMHO.
Steve.
My System:- dCS Vivaldi Transport + dCS Vivaldi Apex DAC + dCS Vivaldi Master Word Clock + dCS Vivaldi Upsampler Plus, Aurender N20 Music Server/Streamer, TW Raven One tt/Graham Phantom II/Transfiguration Orpheus L & Audio Technica ART20 mc's, Whest Titan Pro, D'Agostino Momentum HD pre/S250 MxV power amp, TAD CR-1 MKII loudspeakers, REL Gibraltar G2 subs, Coherent Systems BD Mains, interconnects & speaker cables, Sablon Audo EVO USB cable, Tellurium Q Ultra Silver power cords, Ziro Disclosure & Vertex Roraima Hi-Rez power cords + Furutech FI connectors, Stillpoints ESS racks/component stands, Vertex Aletheia PSU2 balanced power supply, Coherent Systems RTZ3 ground box + CR/BD cables, Acoustica Applicata DaaD room treatment, Mutec Ref10 SE-120.