Thanks to DEC Brian Gnad KB5TSI for sharing this interesting article on MOBILE NVIS antenna systems. http://www.signal.army.mil/ocos/ac/articles/fiedler/dfnjarng.pdf 73 Mark Conklin, N7XYO Oklahoma Section Emergency Coordinator Amateur Radio Emergency Service 918.232.8346 n7xyo at arrl.net Follow me on Twitter @N7XYO www.ARESOK.org