technical analysis is subjective. I already said that earlier. But, it's a bit more scientific in my opinion, then -- oh, you just buy when the trend is up, and sell when it's going down, which is about what half the alternative comments are posting. What is a trend? Back to subjectivity.
At least a channel trend is a little less subjective, than say elliot waves. What alternative would the other posters suggest for a systematic based approach?
Just about any system you come up with is ultimately going to be subjective, including a random entry guess with exit decisions based upon win/loss outcome.
About the only systematic approach that's guaranteed, in my opinion, is to have access to order flow and a lot of money, which unfortunately, I don't.