Thats a good idea it could be the coil. I have not had 2.4ghz problems in 1/10 or 1/8. I noticed the 8 cell spektrum transmitters seem to have better range than the 4 cell spektrum transmitters. I think the range problems are in the Spektrum transmitter because my 3pk w/spektrum module has really great range using the same receivers ,better than any of the spektrum transmitters Ive had. The 2.4ghz Ive had- dx2, dx2.0, dx3, dx3.0, Dx3r, 3pk spektrum module, losi lst2, and now airtronics fhss2. The fhss2 is new to me I am trying it out tomorrow, just got it installed. The second version of fhss is supposed to be better than the first. The mx3fg transmitter menu is the easiest I have ever used so far! It has 18 model memory if I remember correct so if it works well I might power all 6 of my cars with it.