Radio not picking up stations

Hello my name is Mike from USA,
I have a 94 base with the factory radio however is isn’t picking up stations. It to me seems like a ground shorting out. The antenna connections look good as far as I know. When I repaired the antenna the connections seemed fine. If there is a ground short I do not know where it to look. If there is any advice I would appreciate the help dearly. Thanks

Did You always had that problem, is it a Japanese import, You may need Radio Band Frequency Expander Converter.

It worked fine, it was going in and out . Seemed liked an antenna issue or ground. Also the cassette not the cd changer work. It could be a fault in the unit itself. I’m thinking of changing the whole thing out with a modern radio but I was hoping to keep authentic. I’ll try the fm expand-er suggestion. Thanks