Something to consider is keeping in-home noises (computers, wall warts, various entertainment electronics wich spew rfi throughout the typical home) off the antenna and lead in. I would use the wire from the chimney to tree, and then coax from the chimney to the listening position. A balun at the interface betwixt antenna and coax as well as some judiciously placed ferrites on the coax would help make sure noise is kept out of the delicious yet tender signals we desire.