Without knowing that we dont know whether you are having just a wifi issue or a VM network connection. Different solutions apply?
Can you not just get a Cat5e 0r 6 cable (£2-3) and test it?
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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.