Applications
The discone's wideband coverage makes it attractive in commercial, military, amateur radio and radio scanner applications.
When employed as a transmitting antenna, it is often less efficient than an antenna designed for a more limited frequency range. SWR (standing wave ratio) is typically ~2:1 over the range of the design frequency to the second harmonic and ~3:1 thereafter.
The discone's inherently wideband nature permits it to broadcast undesirable spurious emissions from faulty or improperly filtered transmitters.
Read more about this topic: Discone Antenna