I have a getto blaster for mine. it works awsome !!! Take the head unit with me Hunting or camping, put on the unit and away I go... Don't need it for truck anymore, seeing on how the truck has it built in.. the only thing that sucks, is it takes 8 D batteries to fun the fuggin thing... But it also can be plugged in when power is availiable.
I get the ones that don't have to plug into a base to work, the cradles always seem to wear out from dust and vibration. I have 4 of the Streamer GT units, and 3 of the Streamer GTRs with a 45 minute replay memory, but I think they have been discontinued. the power input on the GTRs are prone to failure, but easily repaired if you have the will and ability to tear into one. I find them on ebay non functional, and fix 'em. they have the high power fm transmitter too....the new ones have reduced signal strength and don't transmit as far.