I can't get more than 30 feet of range, beyond that I get servo jitters. Antenna is fully extended, screwed tight. Both batteries have full charge. I have changed the RX battery. That helped a bit. RX antenna is not broken, I checked the resistance with a multimeter and got 2.5 ohm from tip of antenna to RX circuit board. I have tried with several TXs and get the same result. The only thing I can think of now is that the TX needs to be tuned to the ch 21 xtal I am using. The Tx was originally ch 56 but along the way the xtals got swapped out. Any other ideas, this is driving me nuts.