Any of those FM transmitters are very finicky. I found that holding the transmitter in my lap would help sometimes.
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I have the motorola T505 and I only have issues with interference when I venture into a completely different area of a state (ex: 97.7 works fine in Portland, but if I go to southern Oregon, where there actually might be a 97.7 radio station, I get interference). The T505 is just one button away from autoadjusting to a new non-taken radio frequency though, so no big deal.
There's nowhere I can't reach.