Great article in QST, March 2017, page 35, about tri-band vertical (70cm, 2m and 1.25m) by Edison Fong. I have the dual band vertical, purchased on eBay, from this Professor in Calif. If you don't get QST and are interested, send me an e-mail at wa2diy at arrl.net mailto:wa2diy at arrl.net and I will send you a PDF copy. Mark