That depiction and its associated explanation bring back memories of Dave Leeson (then-W6QHS) at dinner using a napkin to depict wind flowing over a mountain in an attempt to explain to me why both his and my Hy-Gain antennas were periodically falling apart at our respective mountaintop stations. A few years later he had worked out the answers and turned his work and emails into an ARRL book (Physical Design of Yagi Antennas). If you ever consider building a mountain-top station, be sure to take to heart the information in chapter 2 in his book. It's the only source I know from which even a lowly lawyer can grasp why, in a 70-mph wind zone, you have to design antennas for 110-120 mph if located on a mountaintop. 73, Dave K3ZJ On 4/19/23, 3:03 PM, "arrl-odv on behalf of Art Zygielbaum" <arrl-odv-bounces@reflector.arrl.org on behalf of k0aiz@arrl.org> wrote: For those of you interested in DX and in weather, this is an interesting depiction of clouds. https://earthobservatory.nasa.gov/images/151213/wave-clouds-over-the-crozet-... 73, Art -- Arthur I. Zygielbaum, K0AIZ ARRL Midwest Division Director Member, Executive Committee Member, Programs and Services Committee Member, ARRL Foundation Board ARRL - The National Association for Amateur Radio® _______________________________________________ arrl-odv mailing list arrl-odv@reflector.arrl.org https://reflector.arrl.org/mailman/listinfo/arrl-odv