Thanks for explaining everyone!
so it seems the down side to the theraband is you have to put knots into the actual line under the theraband which I suppose is not really that big a deal, and that the theraband may need to be replaced after a really cold night.
Positives are it has the right tension and it looks good.
Bungee cords are the easiest.
Shock cord and theraband...how much length do you like?
I assume no one puts any tensioners on the ridgeline right?