I was surprised to hear your results with the CHA250B. I only use mine on 160 through 20 meters. I found the performance above 20M to be just OK, but not as good as the lower bands. I use an I-MAX 2000 for 17 through 10 meters. I get that same 1.5 SWR all the way down to 3.4MHz. Below 3.4MHz and the SWR starts to climb as you are now out of the antenna's frequency coverage. Most of my best contacts on this antenna were 75, 40, and 20 meters. And with S-9 to 20dB signals. Even though the antenna is not supposed to work below 80M, it does. On 160M I have a 3:1 SWR across that band. (Measured with radio SWR meter, and an MFJ-269 Antenna Analyzer). The auto tuner takes it down to flat within seconds. I am near Harrisburg PA. On 160M, I have talked to guys in upstate New York, Ohio, Indiana, Virginia, and North Carolina. These stations were 600 to 700 miles away, and I can do this at most any time. The contacts were not under special conditions. The signals were not the highest, but each side got S-5 to S-9 signals with good audio. And that is from my 746PRO at only 100 watts. The antenna is fed with LMR-400. If this antenna is installed correctly, and you do not exceed your expectations of it's capabilities, the CHA250B is a surprisingly efficient little antenna. As I said before. I have worked all continents on 80, 40, and 20 meters. As a nice bonus because of the constant 1.5 SWR across the entire HF spectrum, it works very well on 60M.