Fitting a DAB car stereo

I'm pretty sure youll need a dab ariel also

It depends on a variety of things:

1) How the existing HU is wired up
2) Has someone been at your HU harness previously. If so, did they do it right? IME 2 out of 10 cars are wired correctly, the rest are a mess, with speaker phase always being wrong and generally the power wires; it's why some systems can sound terrible as a result. Why people are too tight to spend £10 on a plug&play wiring adaptor is beyond me. In the case of my Mercedes there was a potential fire hazard (positive and negative were taped at the poor joints in the same part.


If it's a plug and play affair and the car has ISO plugs on it the installation is a walk in the park. The DAB aerial will need mounting somewhere but that's about it .

If it's already got an aftermarket unit in there then 99% certain it'll be standard ISO plugs back there so your new DAB unit will plug straight in.
(Occasionally the permanent battery live and the ignition fed live will need swapping over but that's easy enough - most looms have bullet connectors to facilitate that.
You'll more than likely need a DAB aerial as most new DAB head units don't come with one.
Screen mounted antennae are a bit naff and only tend to work properly if the wind is blowing in the right direction and the stars are aligned.
You can get a splitter for about a tenner that will plug in behind your radio and split your existing aerial to give a DAB signal (active ones are better that use a 12v feed) they work ok but quality varies.
Best of all is an active roof mounted DAB antenna, I always use those and never have issues. (About £20-£30)
Hope this helps.


Edit:
Oh yeah, and I agree 110% with DiscoStew about Halfords' standard of fitting.... I used to fit car audio for a living and after having to rectify so many of their howlers for angry customers, I wouldn't trust Halfords to fit a dustcap to my wheelbarrow. :-)