i bought 1 of these for my drive, make up 2 metal poles fixed to the floor along the side of the car.the cover has straps at the bottom to hold it in place.

how to put it up and down http://www.touchlesscarcover.com/gallery1.html

picture of it fixed to the floor http://www.carcovershop.co.uk/Touchless_Car_Cover.asp

basically a big tent shaped to fit a car