well when you have multiple planes that doesn't mean you need multiple radios. most of the time that would be all of your planes are on the same channel. yes you can buy a transmitter with 6 ,8 or even 10 model memery on your channel or any other channel. my sugestion is to find out what channel that no one else is on at your flying field and use that channel. In the us it is illegal to change the transmitter channel unless you have a module type radio. for instance you can buy the hitec eclipse 7 radio and get the spectra module, that way you can switch to any channel you want. the reciever are easier to switch, all you have to do is swap christals. of course if you have a futaba they seperate the band into high and low band. the low band is channel 11-32 and high is 33-60. as long as you keep the reviever christal in the band range for the reciever you should be ok.