if you have traced that cable end to a roof top aerial then it would seem whoever intsalled that used the hole that VM had used to pass their cable through after removing it - but thats an F type connector and i did not think that was used for aerial connectors so maybe something is pushed inside the wall for the aerial and that is indeed for VM - it certainly looks useful
add to that the phone cable comes through the same hole which again suggests its a VM install
to test further connect the cable that came with the quickstart kit to that - it should push or screw on - there a connector there to allow that and see if the BB works
if you trace the phone wire outside that should go to an external box - check if there is any other wire coming from it thats either cut or the other end of the cable you show
depending on the answers to that will depend if you need a tech to sort out a cut VM wire or if you need to find the aerial wire
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Tony.
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