yer i got one from ebay $88 worked great but signals drop out  somtimes depends wher yah put it  mine was the size or a bout 2 match boxes. if yah get one get one with external antannas for the gps and mobil phone  part. nime never had external antannas  .  thay also bring up a map of wher your bike is on you mobil phone etc .  ive removed mine im guna get the external antanna type.

no ther not like a cb antanna just a very small descret ones you can hide but it gives you a better signal compaired to the onboard ones that are built into tha same box as the gps tracker that you would like to tuck away somewher .