Dont mean to keep beating the ADSB-2 drum, but aircraft such as those in the US and Europe will be using ADSB-2.
Thus, per mandate:
"Transmissions from unapproved equipment configurations could mislead aircraft with ADS-B IN capabilities and could also mislead ATC." Such as ADSB-2 aircraft.
“If an aircraft carries ADS-B transmitting equipment which does not comply with an approved equipment configuration, the aircraft must not fly in Australian territory unless the equipment is
(a) deactivated; or
(b) set to transmit only a value of zero for the NUCp or NIC.”
NIC set to zero means null location. ASA has already stated that ADSB-2 aircraft must transmit 0 NIC
From the ASA maps, you can interpolate coverage below 5000 feet as being pretty minimal. In the US, ADSB will not be required for at/below 3000 feet, because of the coverage issue.