Iíve had vor/loc/ils on both of the 12ís Iíve built and mounted both of the antennas on the bottom of the tail cone fairing under the stabilator. Works fine and you donít even notice it there. Skunkworks mounted his in the baggage area on the channel that runs from the roll bar to the tailcone. Works fine there too. If you are still building and have access to the top of the vertical stabilizer, I think itís still best to have it up high. I used the same antenna Rob recommended.
Wag Aero Sport Trainer
N588DF RV12 #336 Sold
N73DF RV12 #244 Flying
Rans S21 Outbound (Coming soon)