Dont underestimate the complexity and cost that tags along with ADS-B antenna work, especially for fabric and composite aircraft. The top of the Legend Cub in the photo to the left is already tight on antenna real estate. Example pricing below is for basic installations.
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Panel Planner 101: Cessna Centurion IFR
All-in with flagship Garmin big screens, there are ways to save money by using existing equipment.