Check you squelch setting on your audio panel. The static you hear when airborne may be air noise being picked up by your mike. Turn up your squelch setting a little and see if it goes away. I made this mistake a few times myself but finally figured it out. ANR headsets allow you to hear stuff you've probably haven't noticed before due to the general noise level.
Jim Harris, RV7A, 2nd owner, N523RM
IO-360, Hartzel CS prop, Older Aerotronics built panel Dual GRT Horizon WS, Garmin 340, 335, Dual 430s, Stratux hard wired to WS, Dynon D10A (backup EFIS)
Retired - Living the dream - And going broke!