I haven't tried putting the antenna where you put those marks yet, I have been getting about 24 channels without a preamp, including ABC fox (the 23 channels), PBS, Russian Television, and the rest mostly just religious channels. My neighbor is getting channel 9 next door from each of the spots I put a yellow dot with the same antenna.
Does that site your using tell you where the sweet spot is? I don't understand how to use that, is there a video tutorial somewhere? I am going to order one of those Juice Pre-amps, is that the best one to get since it was designed for my antenna or would you recommend something different?