We bought it outright from Telstra business at the same time we took out the plan. But you should be able to buy it outright from any Telstra shop.

Other thing you could do would be to put the antenna on the side of the donga rather than the roof, makes for a smaller target and if you put it on the side closest to the tower you shouldn't loose any signal strength.

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Osama Bin Hooning
Senior Terrorist Operative
Perth-Wrx