I was going to say what jetmech and rlipsett had pointed out about the high low band of futaba. and that it is Illegal to switch channels on a non module radio in the us with out retuning from the repair shop.

and the other thing is like txaggie said you can fine a rear channel to use. I have a 7c with 10 model memery and havn't had a conflict with my channel yet. I did exactually what txaggie said and I went out to the field and noted what channels everyone is on and I got a channel I haven't seen anyone using. even at all the fun flies I've been to I have't seen the channel used.

I really seems as thought the pattern is that everyone used the channels toward the middle of the range more frequantly the the very top or the very bottom of the channel range.