How to Bend Metal for a Low Tunnel, High Tunnel, Mini "Greenhouse"

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How can you make a simple, cheap, strong low tunnel, high tunnel or what the common man might call a mini greenhouse? Though technically it is not a greenhouse.
Here are some benders you can buy
Where to buy - If you click on this link you can find a 6 foot, 10 foot, and 20 foot wide hoop bender