@DrummondLooks like Optus support are not going to answer!!!!
Instead of asking Optus you can use the "Aus tower" app on your phone to see where the towers are near you and what bands they have on them.
If you want to use a PC/MAC then you can search for towers near you on the following web site:
If you are using a Hauwai 4G modem check out the following app to see what the modem wireless stats are:
You can also have a look at the following thread for examples of the app and one for the phone:
Hope this is of some use with the antenna direction placement.