Helicone Antenna

This project stems from my earlier work with helical antennas. The idea is that if you take the general principal of a helical antenna, but make it taper at one end to a point, so that a cross-section looks like a cone. This might also be implemented as a spiral on a pcb, but I don't yet know what properties of the antenna this would change. My initial prediction is that the antenna would be highly directional, but be able to pick up a multitude of frequencies at a somewhat modest gain versus a single frequency at massive gain.