Does anyone know of work on building a broadband HF antenna based on the spiral on the surface of a sphere design? Both Balanis, 2016, and Stutzman & Theile, 2012, show spiral examples.
It looks as if with a program to account for catenary and stretch it would be a reasonable tree supported insulated wire antenna. Not as simple as a trap dipole, but not too much more complex other than threading all the wires through the support strings with enough strings to adequately approximate a sphere.