What does your existing aerial look like, is it on the left or right side? Are you able to post a photograph?
As others have fitted in the past, if you want TV and DAB in one unit you need 4E0 035 225 AK; or 4E0 035 225 AL. The difference between the two depend upon the glass, either heat insulated (AK) or laminated (AL).
4E0 035 225 G refers to an aerial for TV and the webasto heater.
But get a photo posted so we know your existing aerials, you maybe able to keep your DAB and add another just for the TV connections.
I've labelled an aerial so you know what connections are what service.
