need a good long range antenna. broadcast towers are 50-55 miles away, and spread within 40 degrees of each other. I have a tall shed that I plan on mounting the antenna to because it's out of view from the neighbors and myself. it's about 100' away from my house and I already have an extra underground pvc pipe to run the coax in. I plan on adding a 7777 preamp for signal loss. From what I've read here and other forums, I'm thinking about going with the Antennas Direct 91XG or the Channel Master 4228HD. Or is there another I should think about? I'm concerned about durability too because it gets pretty cold here in Wisconsin.