Most OEM DAB radios come with rubbish antenne, when I fitted the excellent Kenwood DAB+ head unit to my MGF, I didn't bother with the toy stick on the window antenna that it came with, instead I fitted a 3db high gain antenna, to do this I drilled another antenna hole on the opposite side to the existing FM antenna (still in use for FM reception)
I get fantastic DAB reception, even well out of the DAB broadcast footprint.
If the reception was any better it'd suck the radio transmission towers off their foundations!