Crew Dog Electronics

Reception issues, using either antenna

I've had marginal to poor GPS issues with the Stratux in my plane. I am wondering if there some interference that I might be able to overcome with a different antenna?  I get the same results whether using the rabbit ear or the CDE supplied eternal antenna on the glareshield.  Or, is this more to do with the unit itself?  I'm in southern/central California with good line of sight to GPS, so not sure what's causing the poor reception.  The fuselage does have a chromoly cage, but I figured the remote GPS antenna on the dash should over come that.  Does the steel/magnetics have any impact?