Yep, diversity antenna. My epiphany came last year when i realized that I might listen to 1 AM station, and zero FM stations, as well as I really don't have any cassettes running around anymore. (My god Jim, what year is it?)
Add to that, the SoCal area, the FM frequency stream is saturated so its very difficult to find a setting that doesn't get some kind of radio reception, making sound spotty.
So, to fix that, I just disconnected my antennas completely. This solved the cross-broadcast problem because without the antennas the BT/FM plug was more than powerful enough to override.
At that point, I found the best open FM dial i could. For me, 91.1.
Now, i stream from my phone, and with "radio" stream stations, I never looked back.
In the end though, after all these work arounds, I got to keep my factory radio, which was the goal
Amazon.com: (Upgraded Version) Bluetooth FM Transmitter for Car, Wireless Radio Transmitter Adapter Car Kit, MP3 Music Player, Dual USB Ports, QC3.0 Quick Charging, Hands Free Calling, Support USB Flash Drive : Electronics
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