With such a tall wire, going up more than 120 feet, it seemed like a good idea to use it also as a 160m vertical. Lets just say that this collinear (and its improved new cousin) has worked well enough to keep its position pulled up in the tree. A 20 meter trap inductor wound from the coax defines the end of the lower half-wave section. For the 20 meter collinear, there is an upper half-wave section, a phasing inductor, and the lower half-wave section that includes the feed point from the 75 ohm coax. A diagram is shown in the figure on the right. My first 160 m antenna is a modification of a 20 meter collinear vertical that I was experimenting with.
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