This antenna originally came from abroad, and the description of this antenna abroad: "It is widely used in military, water conservancy and other emergency communication. The antenna is concealed, easy to erect, does not need to be debugged, and does not require a day adjustment. It can be at 1.5-30mhz. Short-wave full-length work, 0-500 km without blind zone, effective distance and inverted v antenna, effective communication within 1000 km." As early as in 2005, I have done 1 batch for a few radio friends in Shenzhen. It is quite practical and convenient. It is especially suitable for those who are not ideal in urban setting, and who are too small to be able to set up. Friends who can't go up, because it can be erected in the roof, balcony, window sill, field, etc., and can be erected in various forms, horizontal, inverted v, triangle, frame, serpentine, folding, window, etc. Etc., and it is invisible erection (outsiders do not know what this is, think it is the rope to dry clothes, free of complaints). When it is erected outdoors, it is more convenient. You can easily pick up the antenna at a distance of 0.5 meters or more on the roadside. The geographical position can't straighten the antenna. If there is no problem, let the antenna go around 's'. Type can also be done, 1 minute to get the antenna erection! ! It is a good helper for setting up radio stations in special outdoor and setting up radio stations in special environments! ! !

Recently, many HAM friends, feedback back, HF20A tilted 10 degrees in a frame-type horizontal, the communication effect is very good. Particularly representative is the BG7YB (Hainan Haikou) triangular window obliquely pulled down to the big tree downstairs, which communication effect is comparable to the short wave Yagi, the sound is loud and full, the signal is just, within 1000 km, thunder-like signal! Extraordinary!