LW/MW and FM antenna suggestion for old car radio (25 years old)
You can keep things simple, just by plugging in a 1 to 2 meter wire connected to the center pin of the antenna jack. String it upward, vertically, if possible. That should pick up AM stations in your area, and FM as well.
If you want to pull in more AM stations, make the antenna longer, and hang it higher. If you're picking up too much noise (e.g. from fluorescent lights or motors in your home) you could use a coaxial cable between the antenna and the car radio, moving the antenna onto your roof.
Want to receive distant stations? Google &quot;AM DX&quot; and you'll find hobbyists who are serious about receiving stations from as far away as possible, and they will have plenty of antenna suggestions.