I had one of those itrip adaptors that hooked up thru the headphone jack. I to had a hard time finding a station that was "empty" to get descent sound from. So I hooked my power antenna up to a toggle switch so I could put the antenna down when wanting to use the phone as a music player. That helped and all was good. Although last summer I just bought a new head unit that had built in blue tooth and that was so much better.
The itrip thingy that I had was only about 35$ less then the Bluetooth head unit. I wasn't looking for the best on the market, but everything works great, not just music, but I can take and make phone calls with just using Cortana. The head unit also reads out my text messages for me and again I can just dictate my replies thru Cortana.
The head unit was going into my 65 thunderbird, so it wasn't just a quick and easy plug and play job. But still it only took about an hour to be in and working, and i don't think I would want to go back to one of those adapters...