I recall my dad had to repair the factory Blaupunkt quite often. He would do it himself. Just hangin' out in the workshop, with the stereo opened up. He was a Heathkit kinda guy.
Anyway, the antenna does sound likely if "loud static" is the issue, as a failed amplifier would emit either nothing, or a loud hum.... a failed tuner section may well be the case but it's far more likely to emit no sound at all, than to emit static. Static isn't just the sound of failed electronics; static is an actual (if random) signal that is being picked up and amplified properly...
So I think you're onto something with the antenna. Check the wiring to your antenna before you do anything drastic. Pick up a spare antenna and plug it directly into the back of the radio, and see what happens, before you go yanking your radio and paying someone to tear into it. And if they do tear into it, don't be too surprised if all they find is a broken internal antenna connection, or a single failed component that throws off its tuning frequency. Something pretty simple.
My older brother tore out the Blaupunkt in the 1980s to install a cassette deck. Remember those? They might go a year between failures. My car went through a bunch of 'em. I remember having a dream once where I took her into the shop and asked for the usual maintenance: a tune-up, oil change, and a new stereo.
I eventually gave up and installed a modern CD player with HD radio in the dash. Yes, I cut the dash for a standard sized CD player. The amount of originality lost is trivial compared to the amount of awesome music I have now, and I haven't missed the old Blaupunkt, not even the cool mechanical push buttons. Okay, maybe a little. But I respect you all the more if you've got the urge to fix the Blaupunkt. Go man.
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