This wire basically carries the signal for your radio antenna. It’s a coaxial cable, meaning it has an inner conductor surrounded by insulation and a braided shield, all designed to deliver a clean signal. It transmits the radio waves picked up by the antenna to the radio unit itself. Sometimes it also handles signals for things like OnStar or your satellite navigation, depending on the vehicle. It connects the antenna – usually on the roof or a fender – to the head unit, which is your radio and entertainment system. It’s part of the whole system that allows you to get radio stations, and in many newer cars, allows those other connected services to work. Think of it as the dedicated pathway for that specific signal. Well, if this wire is damaged or corroded, you'll notice if you’re getting poor radio reception – static, weak signals, stations cutting out. If it's completely broken, you’ll likely get nothing at all. The braided shield around the wire acts like a shield against interference, so if that’s compromised you’ll pick up a lot of noise. It’s a relatively small part, but it’s crucial for a clear signal. A good one keeps everything sounding clean. We can get these pretty easily, Fixparts Online has a good selection, and it's usually a straightforward repair if you're comfortable doing it yourself. One size fits all: Aerial Wire (MPN 1T0035550L) has a 12-month warranty!

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