If it's 10' longer than the mast, let it extend about 5' at each end. Get some 8-10' 2x4's and wrap them overlapped to the mast and foil, so they stiffen it. The foil can extend a foot or two without support. If the mast is painted use rope
or wire ties (not plastic tape or wrap) because plastic wrap can cause paint
bubbling if it traps water
. Wrap the mast in carpet using tape (not bubble wrap if it's painted) so that any rubbing between the mast and foil doesn't damage the anodized finish. You can buy cheap
indoor/outdoor carpet in odd lots or any carpet store might have scraps in the dumpster, or for cheap
. You can use bubble wrap on anodized finish.
Edit -- use a type of tape than can handle sun and wetness without leaving a difficult-to-remove residue. 3M electrical
tape (available at Home Depot) is good for that. Do not use masking tape (doesn't handle wetness well), or duct tape unless you know it will be removed within a week.