If your car is old enough to have a tape deck, they have cassettes that connect via Bluetooth. Just about perfect sound quality since there is no interference.
I remember when those things first came out and used a headphone jack so you could plug in your CD player. (those were the days…)
I was actually kinda pissed when I had to switch to a car with a CD player and couldn’t use it anymore.
I changed cars in January and the car I previously drove, an 05, Jetta had a tape deck. I bought this to connect my phone. Surprised that it handled calls as well.
Yeah those worked way better than the fm transmitters. Only problem was my car introduced a humming sound into the signal that got worse with speed lol.
It’s probably interference from your engine’s ignition system. A better quality setup might have built in protection from that.
