Radio and rear heated screen issue

n33712

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Hi

Have a 2017 A6 Saloon. Issue is whenever i turn on the rear heated windscreen i lose all radio signal (DAB, FM, AM) Occasionally, for a short while,i guess when signal is really strong, it still works but very crackly etc.
The rear heated windscreen is really poor as well - not sure related though.

I have researched this issue and everyone suggests on other posts that there is likely a break in the circuit in the rear window, as these are the aerials as well......but there is one big difference....this only occurred when i replaced the car battery.
It could still be the circuit in the window and did not occur previous as maybe not enough current was going through it?
Could it be anything else?

Appreciate any advice :)

Many thanks