What a pity Airservices was not similarly minded here. The Aireon ( iridium based) is going to be equipped on the next satellites that are going into orbit and of course gives coverage everywhere.
The Aireon system will only work with aircraft fitted with ADSB out antennas on the top and bottom of an aircraft. (The aircraft will shield the signal from satellite). Testing once hardware is flying will determine the effectiveness of single antenna installations.
Bevan..