There was a lot of prep work involved to fit the doubler. The most time consuming was using the pop rivet dimple dies to make the dimples for the flush pop rivets in the fuselage skin.
I sealed the antenna to the fuselage with silicone caulk as per the EAA video on the subject.
Everything turned out good and I'm sure the other antenna installs will go a bit faster.
Doubler plate clecoed in place:
ADS-B antenna installed:
