I never had a problem with the dab signal and I am on my second T6.1. Until recently, when I swapped out my amp for a bigger version of the Audison 5600. Since doing this my dab signal cuts off all the time. Im thinking it could be interference somewhere, but everything is the same as it was. I have just upgraded to a slightly bigger amp and in doing so lost may dab signal lol.
When I get chance I will reverse what I have done to see if it fixes the issue. It could all just be coincidence but I think not.
Apparently the aerial is in the wing mirrors.