According to http://myswitch.digitalready.gov.au/ you are elegible for VAST satellite coverage because of a low unreliable signal from anywhere.
The major TV antenna manufacturers do not have an MA16 in their current range of products. An MA16 is however a WiFi antenna.
VAST Satellite reception is the best option for you however if you want Adelaide you should be using an phased array antenna on a tall mast but rotated so the antenna elements are horizontal not vertical as shown.
For Riverland you need http://www.hillsante...&ProductID=5028 pointed in a different direction.
Mt Lofty 115 km away at a bearing from true north of 197 degrees.
Loxton 143 km away bearing 112 degrees from true north.
With such distances and a blocked Adelaide path a filtered masthead amplifier is also essential http://www.kingray.n...edge_series.pdf such as a Kingray MHW43 FS with quad shielded cable to the receiver. I do stress that VAST satellite reception is a more reliable option.
Note that you should not use a VHF/UHF antenna for the Riverland as the VHF has been switched off as has channel 2 analog in Adelaide.