Hi ED, mate I have tried everything known to man.
I have and have always used a Telstra 4G My Pocket Wi Fi Lite device, and it has proved to be excellent over the past years that i have had it.
We have traveled Australia with it and most times in the Outback it has worked pretty well.
The unit is plugged into 240 Volts constantly, and has no sockets for any other cords or leads, when it flashes green i have 3G and when it flashes blue i have 4G, presently it is green and something is making it all happen very slow.
I check the Dbm's and signal strength and it is all in the good to excellent range, and this is on either my lappy or desktop, so there we go.
A very generous member on IIS is sending me an Antenna and a WiFi device that he is not needing which may prove helpful, so time will tell.
Thanks for you suggestions.
Leon