I have a Tower 6 channel radio and I had the exact same problem. My issue turned out to be the antenna was not screwed all the way into the case. I unscrewed it the rest of the way, took it out and cleaned it all up and then screwed it all the way back into the transmitter. I haven't had a hit since I did this. I realize that this would be a longshot with regards to fixing your problem, but give it a try anyway. Good luck