Finally, your transmitter must have a dependable power source and be placed near to your antenna. The AirPlay takes its power directly from the iPod. Where your antenna is determines how close you can place it.
FM signals are what is known as LOS(Line of Sight) waves. Unlike wireless computer cards, these signals do not travel easily through solid objects, and are deflected easily by metal. So if you place your iPod/AirPlay combo in the center console, it has a lot of material to go around to reach the antenna if it is on your rear fender. Best positioning: up high and close to your radio antenna. We hope to have a special solution for this type of positioning soon and will keep you informed as it becomes available.
Where the AirPlay shines is in the large spaces between cities. If you're a traveler that must be on the highway for hours at a time, and don't want to listen to XM radio, or spotty local coverage, the AirPlay is great way to free your ears from headphones. Best of all it costs less than a set of high-quality headphones. If you can find a weak station, the AirPlay can override that signal, if it is placed properly. So even in canyons, between buildings and areas of poor FM reception, you can keep your tunes going, because your transmitter travels with you.