Why this picture is important

I was driving away from my mother's house and realized i had forgotten my ipod in the house. I had left it sitting on the cradle with the itrip attached while it played music to my stereo in the house. As i backed out of the driveway i realized that the radio was playing the music from my ipod. I drove away until i just barely started to lose reception; at that point i stopped and snapped a picture of my distance from the house. You may have to work a little bit to make out my mother's house through the wet window.