As per title really, I have a RNS E with navigation plus and in the bottom left corner is a button to switch between radio/CD/TV on it, now I have the radio and the CD but no TV function, I understand this would have been an optional extra.

But how hard is it to install the TV function?

I found this:

AUDI RNS-E A3 A4 A6 MULTIMEDIA INTERFACE ADAPTER HD TV FREEVIEW DVB-T TUNER | eBay

Is this the kind of thing I need?

Also do I then need to buy some kind of antennae for it?

And presumably I will then need to get it "coded" to my vehicle? How?

Any help greatly appreciated, lamens terms please Im not fully up to date with the technology side of these things yet.

But Im learning