I recently purchased and built an Aeroworks Edge 540t (46-61) which despite trying two totally separate crystals and receivers still experience unusual interference in the air. Initially there was interference on the ground, but the the antenna was rerouted outside of the fuselage (due to possible interference with the pull pull rudder system) and the ground interference ceased. The plane now seems to perform regular range checks (with the antenna collapsed at 100 feet from all angles) both with the engine on and off, but still goes wild in the air. After three thirty second flights (on separate days) I am left without any ideas on how to proceed.

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The receivers both have standard length antennas, one has been used in another plane before
The crystals are on channel 11 and 40, one has been used in another plane before
The transmitter works on both those channels
The plane is powered by a saito 1.25
There is no metal to metal contact other than the wheels collars to the axles (with the exception listed below)
The antenna does not touch any other wires and is routed straight to the end of the plane with no folds or knots
Other planes (even on the same channel) fly fine in the same area (which is outside of most city interference)
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The only possible cause I can think of is the rudder/steering wheel assembly. There is aluminum to steel (which was assembled according to the ARF instructions). Is there any possibility of aluminum to steel causing interference?

Thanks,
Gary