The Z-Band system uses RF video over UTP or FTP (CAT 5e, CAT 6, CAT 6e, CAT 7)  in the horizontal thereby eliminating the cost of installing coax. The extra cost of coax is more than just the cost of the wire. Common practice is to have a separate conduit, tray or plenum, which all add significant costs for both the material and labor to the installation when compared to RF video delivered over UTP or FTP.