My GTX-45R transponder is on back order until mid July or so. My plan is to mount the unit just behind the baggage sack on a plate I fabricated back there. I have been slowly getting things together to start skinning the fuselage and that got me to thinking what a pain that was going to be to install the transponder with the skin on. I asked Stein (who I bought all my avionics from) if I could possibly get the accessories kit for the transponder now so I could get it all ready to go. Stein could not have been easier to work with and sent my kit that day. I fabricated the brackets to hold the mount and made sure that the unit points directly towards the cockpit. The Bluetooth antenna is located on the front of the transponder and communicates the ADSB In information to my IPad that way.