Ariel? Do you mean the white co-ax cable connection from the TV box to the wall socket? If so its not an ariel it carries all the TV channels. It can be replaced with a longer one yes... whether they will do it for free or charge you £25 depends on how long its been installed. Is it a new install or are you just wanting to move the box around?
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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, 1 WiFi, 1 on PA) Hub5 in modem mode with Apple Airport Extreme Router +2 Airport Express's. On 250Mbps, Talk Anytime Phone, x2 Mobile SIM only iPhones.