Radio Antenna: Open Circuit Code
 

I have had this code since I bought the car in January:

Address 56: Radio Labels: 8D0-035-1xx-56.LBL
Part No: 8D0 035 195 A
Component: Radio D00
Coding: 00205
Shop #: WSC 06335

1 Fault Found:
00856 - Radio Antenna
36-00 - Open Circuit

The only symptom that I have noticed is very poor AM reception.

I know very little about the radio/antenna system but I do want to try and fix it myself. Any help is appreciated.

bump

diagrams of the antenna system? anything? please