I discovered this by accident on my 1 hr and 10 minute commute to work. I like to listen to AM radio and about half way to work I lose reception. So I decided to download the Iheart radio app so I could stream the radio station I like on my phone. While my phone was downloading the app I plugged it into the USB jack under my center console and when I did that the AM reception increased significantly. It improved so much that I can hear the commentator for 95% of my commute where before I was lucky to hear it for 50%. Ironic thing now is I do not need the app.(cheers2)