Oh heck who cares about what frequency is used. Just get you Ham license and fly on six meters... HEH HEH HEH. I already have my license but I fly on channel 39 right now. I've got a 6EXA and I agree with the Aggie. On a college student budget it is more economical to have one radio that can hold multiple models. Plus the 6EXA has some advanced features that allowed me to progress from trainers to more aerobatic aircraft. No, none o my planed use more than 4 channels except my Uproar which has the ailerons set up for CROW and mixed with the flap knob. Pretty cool flight characteristics when the ailerons are both flipped up. More to the topic, while it may be more cost effective to buy new crystals, you do need to make sure that your receivers do not have the HI LOW split that Futaba receivers have. If you have Hitec receivers than go for it. If all you have is Futaba, send the radio back to Futaba and have them retune it. I feel that may be less expensive than buying many receivers.