A Simple Pull-up Mono-Band Vertical Dipole Antenna Design – and 4NEC2 Tutorial

I have a nice off-center-fed dipole (OCFD) antenna that is my mainstay for multi-band HF work, but I would like to understand it better.  With a wire antenna tied to trees it is not a simple matter to quantitatively determine the antenna's radiation pattern experimentally.  One way to get a handle on this is to compare [...]