Multimedia not functioning as it should

[Danielle1505]

Hi, I bought a 2013 model about 8 months ago and soon realised the dab and sat nav were no longer working, I have explain to an elec mech and they reckon I need a new aerial..I'm just wondering if this is a common problem and the best way to go about it? I've seen these plug and play systems and not sure if I could set one up and by pass the problem. Any help would be appreciated.

Tia