Originally Posted by
Firebottle
In my heyday I used to fix car stereos for a living, long time ago now, before I got a 'proper' job :eyebrows:
Anyway I have a couple of suggestions:
Attach a separate earth lead from the case of the stereo to a suitable chassis connection, or better still directly back to the negative terminal on the battery.
The existing 'earth' is probably just through the fitted loom, not that great.
Check that your antenna mounting is making good contact to the chassis, you may have to scrape back to bare metal.
These fixes usually got rid of unwanted interference.
Cheers, Alan