Fella's sell your Crystal type transistors and get a Spektrum radio. That is if you can find someone willing to buy a crystal type anymore. That is the only problem at our field is if more than one have the same channel. Interference is not a biggie. But seems like the guys with the crystals all seem to have chosen the same one lol. Or when you have a different than most one other will have the same. And if something happens first words are did someone have there radio on. Spektrum DX6 and 7 are both very good radios. Or another name brand with 2.4 all your worries execpt low batteries are solved. I know they are expensive but not after losing planes because of crystal interf.