Most of my radios are Hitec and would not have any problem using this rx. The only problem might be its size but in most planes at that size, its not an issue. But isn't your Futaba 6EX a 2.4 GHz ? If so the Hitec Supreme IIS 8-Channel FM Autoshift DC Receiver will not work because it is a 72MHz FM Receiver. Somebody correct me if I'm wrong. I'd hate to mislead this guy.