help interference problems

[the mad1]

hi i have just upgraded my radio gear to a gemini 2 40mhz fm and a hitec hfs-03mm receiver i put it in my losi xxx-cr i am getting all sorts of interference if i remove the receiver and hang it over the side it seems to be ok but soon as it goes near the chassis im getting it again

i used the radio and receiver in my mardave saturday and it was fine

i have also put my old 40mhz am receiver in there and tried it with my old radio and its fine no problems

any ideas as its doing my head in