ORIGINAL: hogflyer
One thing I noticed from your picture is you have your antennas are routed parallel to each other for close to half of their length. I don't fly Futaba 2.4 but Spektrum, and I make sure my antennas are routed perpendicular to each other. Not sure if could contribute or not.
Hogflyer
Yes, as hogflyer stated, it's best for the two antennas to be completely perpendicular to each other, not parallel for much of their length.
Jack