It claimed the method to buy/sell "the VIX" (which itself can't be bought or sold) is to take the 11 day and , plot them and buy when the goes under the , and sell when the goes above the .
Here is a chart of the vix and a little indicator that I coded up using the method described. The red line is the and the white is the . I colored the background "green = buy" and "red = sell".
Seems there needs to be a bit of refinement for this method to work ... but it's a start. Would welcome other ideas in the comments.