I live in a rural area, so it's really easy to find unused FM channels for my iTrip. However, when I venture out to the city, I do have to change frequencies fairly often to keep the signal from my iPod clear.
It seems like it doesn't fit as snugly against the device as the iTrip for iPod Nano fits against the Nano. Perhaps it fits better with an iPhone; I'm using it with an iPod Touch.
Overall, I'm please with my results and would purchase again.
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