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Jack,
One option for a more permanent air dam is conveyor belt. It is available used off ebay or other surplus sites. Several members here including me have used it.
Basically you would attach it firmly at the top (i.e. where your duct tape is now) and let the lower end hang free. A solid attachment at the top (i.e. small bolts with backing) and curvature across the front will keep the bottom end stable for wind loads, but if you hit an obstacle it would just deflect and bounce back.
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