Hi SOTA Fans!
Why not a wire pyramid for SOTA avtivation?
It needs no more than a 7m or longer fishing pole, a few meters of string, 4 spikes, 40m of #15 to #18 wire plus about 10 meters of light-weight coaxial cable, e.g. RG-58/u. The 4 sloping lines have double role as those are not only radiating but also fastening the holder fishing rod. In possession of some experience a single person too can erect it in a few minutes.
As far as it can be judged reading Karl Rothelmer’s Antenna Book, it will work fine at 7 and 14 MHz, but not at 10,1 and 18,1 MHz. As it is a full wave wire at 40m, the main SOTA band, it provides somewhat more signal compared to a half wave dipole. Being a closed loop, it is less sensitive for static charging, thus it provides more silent reception. It has a circular radiation pattern and this is an advantage for activators especially in the LX-HB9 strip. Finally it provides a low radiation beam elevation angle that may be advantageous for inter-continental connections. That is, there are more pros than cons as it provides a solid performance… at least according to technical papers.
Has anybody out of you collected practical experiences with a wire pyramid during SOTA activation?
73: Joska, HA5CW