Well you can... if you get a 20/30/50m run of Cat5e cable for ~£10 and just trail it up there for an hour or two whilst doing the testing,
But anyways... you have 3 options for connecting a "distant" V6 to the Hub
1) Ethernet cable connect it to the Hub – always the best solution and not as difficult as you might originally think – good/flat Cat6 cable is relatively cheap and easy to conceal beneath carpets, skirtings etc
2) Or - improve the wifi signal at the V6 location – there are lots of discussions and options/suggestions for how to do that on this forum – n.b. the V6 works best on the 5GHz band. If you go Home>Help>Settings>Network>Connection - what does it report about the quality of the network connection?
3) Or connect the V6 to the Hub by good quality powerline adapters and short Cat6 cables (assuming your electric circuits connection is ok to support that)
--------------------
John
--------------------
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.