In about summer of 2104 a group of us on the forum experimented heavily with NVIS antennas and use. This is good for comms in a 200 mile radius area that is typically out of range for line of sight (VHF/UHF) comms and too close in for HF "skip". So, NVIS allows you to use HF to talk in that donut that is too far for VHF, but too close for traditional HF. When you see a hummer with the antenna pulled horizontal, that it for NVIS operation (not just storage). I'm game for experimenting with NVIS again. BTW, this only works below 10 Mhz, so is perfect for 40M and 80M.
Think of NVIS as shooting a garden hose to the inside of an umbrella and the water falling back down close-in, rather than a stream of water being shot unimpeded off in a direction. We are using NVIS to shoot our signal straight up and rain back down close-in from atmospheric reflection.
[IMG2=JSON]{"alt":"Image result for NVIS","data-align":"none","data-size":"full","src":"http:\/\/www.w9xt.com\/img_1224968365_15581_1376259394_mod_547_398.jpg"}[/IMG2]
Think of NVIS as shooting a garden hose to the inside of an umbrella and the water falling back down close-in, rather than a stream of water being shot unimpeded off in a direction. We are using NVIS to shoot our signal straight up and rain back down close-in from atmospheric reflection.
[IMG2=JSON]{"alt":"Image result for NVIS","data-align":"none","data-size":"full","src":"http:\/\/www.w9xt.com\/img_1224968365_15581_1376259394_mod_547_398.jpg"}[/IMG2]