Lower frequencies on FM transmitters?

OK, I have a Monster iCarTunes FM transmitter and charger. It worked great for road trips for a couple years, but like everyone else in a large metro area I couldn't find a setting that wouldn't get interference from the city's radio stations. I use a tape adapter in town, but it rattles and the sound quality is not nearly as good.
The transmitter has now died, and I'd like to get something better. My question is, does anyone make an FM tranmitter (and charger) that transmits at frequencies below 88.1?
I have friends who have transmitters for XM Radio and CD changers that transmit at 87.7 and 87.9... why can't the iPod transmitters do this?
Please let me know if anyone has made such an item... or if not, WHY?
Thanks,
-ME

buy the neo ion mp3yourcar.com

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    Greetings from Germany
    Henrik
    LV since v3.1
    “ground” is a convenient fantasy
    '˙˙˙˙uıɐƃɐ lɐıp puɐ °06 ǝuoɥd ɹnoʎ uɹnʇ ǝsɐǝld 'ʎɹɐuıƃɐɯı sı pǝlɐıp ǝʌɐɥ noʎ ɹǝqɯnu ǝɥʇ'

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    Greetings from Germany
    Henrik
    LV since v3.1
    “ground” is a convenient fantasy
    '˙˙˙˙uıɐƃɐ lɐıp puɐ °06 ǝuoɥd ɹnoʎ uɹnʇ ǝsɐǝld 'ʎɹɐuıƃɐɯı sı pǝlɐıp ǝʌɐɥ noʎ ɹǝqɯnu ǝɥʇ'
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