I ordered all of the antennas. I got the ADS-B and Transponder Antenna from Delta Pop Aviation and the two Comm antennas from Aerotronics. Here I installed the ADS-B Antenna in the back. First I had to shave off some of the front of the antenna because of the interference with the bottom skin. Don from Delta Pop was nice enough to send me this drawing so I could see how much I could remove for a good fit.
Then I fabricated a doubler to add a little strength in case the antenna gets bumped.
I also installed the bracket for the ELT to put that in place.