Your install manual should give you antenna install requirements for optimal performance.
My ACK manual states "The antenna must be mounted externally, on airframes of metallic construction. The antenna should be mounted as close to the ELT transmitter as practical. The coaxial cable connecting the antenna to the ELT transmitter, should not run in close proximity to comm radio coaxial cables, and should avoid crossing aircraft production breaks. (i.e. Riveted fuselage sections) The antenna must be mounted within 30 degrees of vertical, when the
aircraft is in normal flight attitude. The installed antenna must be able to withstand a static load of 100 (one hundred) times itís weight (13 lbs.) applied to the base of the antenna, along the longitudinal axis of the aircraft."
I installed the antenna just forward of the vertical stabilizer.
Skyview, ADS-B, Garmin 420W, TT Gemini AP
Guthrie-Edmond Rgnl, OK (KGOK)