Standard advice is no not use any 3d party coax it will bork the network. The best thing to do is to install smooth conduit tubing between the two points you want connecting and instal pull ropes (strong string!) in inside it so that VM can simply pull their correct cables through at install time
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John
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I do not work for VM. My services: HD TV on VIP (+ Sky Sports & Movies & BT sport), x3 V6 boxes (1 wired 2 WiFi,) SH2 in modem mode with Airport Extreme Router +2 Airport Express's. On VIVID200, Talk Anytime Phone, x2 Mobile SIM only iPhones.