Pheadrus or any other TA,what sort of stop loss do you use?

I am currently using one that Allan Hull devised,using a channel based on average true range but modified so that the bottom channel line flattens as soon as the price starts moving down,and first close under that line is a sell but; I also use another to compare and still find that they can whip you out of a position early,any ideas would be greatly appreciated.