Steve
I have had a DAB radio fitted to my +4 for a couple of years using a screen mounted antenna.
The antenna I used has a small pre-amp box about 35mm sq and two very thin wires coming out horizontally.
I mounted the box behind the mirror mount and fitted the wires along the top of the screen.
Unit requires 12v which inmy case is fed up the coax from the radio.
I have found this arrangement works very well and does not need any body work drilling etc.
If I could find out how to add pics I could send one showing installation
Howard 2010 +4
