Best DAB car radio adaptors

Digital radio has had a significant impact on in-car entertainment over the past decade. The tech is now fitted to almost every new car as standard, and is how more than 60 per cent of us listen to the radio. There is even talk of permanently switching off the FM transmitters in the near future, making many car radios obsolete. 
But some relatively young cars still didn’t have DAB fitted at the factory, and changing the entire stereo for an aftermarket system is expensive and could lo