I purchased the MGL system that comes with the small magnetometer and AHRS. Having read the constraints on mounting, I conclude that you can't meet them all.

I was thinking about mounting them above the passenger compartment on a small aluminum piece that would extend across the compartment above the fuselage structure - basically mounting them in the center of the wingspan. I took my trusty Iphone up there and the compass works well for about a 6" diameter in the center of this area.

I know many have mounted them outside on the wing, but I am not excited about mounting it that far from the longitudinal axis.

Thanks
tom