>>323581273
IOGEAR USB 4-Port USB Extender over Ethernet allows up to 164' extension.
I upgraded from my Vive where I used an HDBaseT Lite Extender for HDMI. Both of these combined worked flawlessly.
Index is DisplayPort though so, I have to experiment again. I'm trying out a CABLEDECONN Fiber 8K 4K DisplayPort1.4 33' cable and a Cable Matters DisplayPort Powered Repeater. 
I don't know if it'll work yet though (arrive Sunday) so recommendations welcome if anyone has tried extending the Index.