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The problem is that the front of the house is south-facing so if I wanted a dish it would have to go slap bang on the front of the house.

My house also faces the satellite. Obviously, I don't know how your house is built, but I solved that problem by putting the satellite dish on the roof just on the lee side of the ridgeline so that you can't really see the dish, or at least only the top of it, from the street, but the dish still has clear view of the southern sky.
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Bitt Faulk