Ch. 36 is really iffy without a preamp. And even with one it may not come in. Green and Yellow signals should be doable with a single antenna on a rotor. No preamp recommended. If you have to use a pre amp then I'd recommend the
http://www.amazon.com/RCA-TVPRAMP1R-.../dp/B003P92D9Y I just bought this and it works fine in a strong signal area. Only caveat is that I don't have trees around me at my current location.
2 edge signals means the signal is bouncing off something twice after leaving the tower before it gets to your location. 1 edge is a single bounce off an object like a mountain.