Having problems with my radio not working where is

I have 2003 A4 Cabrio. Had 2 radio problems - one the volume control and the other not picking up radio channels. I got a reconditioned radio from Audi for £213 which fixed the volume but the signal still not working. Read another article. The ariel cable runs into the lid of the boot - you can see it on the right. I removed the emergency triangle and behind it is the ariel wire. Wiggled it and confirmed the problem was there. Got the signal back but it might be temporary - cable may be damaged or a connection problem because there are amps behind the trim. I have not taken the whole trim off but a lot of it unclips so you can see what is behind