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Thinking about going with the Trig TT31 ADS-B transponder and have a question. I currently have a Garmin GNS 430W unit installed. The TT31 transponder can slide into my existing King KT76A tray but will I have to install an additional GPS antenna or can the TT31 piggyback off of my existing Garmin WAAS antenna?
https://www.trig-avionics.com/product/stack-transponder/
https://www.trig-avionics.com/product/stack-transponder/