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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AirVenture Video: Garmin Cirrus Retrofit
With Cirrus reaching 10,000 aircraft delivered, that means there are plenty of aging SR20 and SR22 models in need of refurbishment, including modern avionics...