On Friday, March 20, 2015 at 4:37:18 PM UTC-7, Bill T wrote:
UAT out meets the requirement. Granted FLARM won't see UAT, but we only have one FLARM unit right now in the area.
TCAS gets an alert from my mode C, and the big boys with ADSB In will get the ADSB rebroadcast data from the ground station.

BillT

Check the installation costs, including ADS-B antenna diversity requirements, plus maintenance for two separate transmitters (Mode C plus ADS-B UAT). Buying a single Mode S/1090ES Out may be a better option in the end.