Finally I've got my automatic antenna. I got it from autotoys.com and it's about 50 cm long (Perfect length).

My question to you guys/girls is, does my 95 st have the wiring for the antenna (power) already in it, or do I have to install a wire for the powerline?

I mean, power for the antenna to go up and down.

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yes its there cant remember the colour but check radio manuel of your stereo it should match