Image of the Biconical.

The biconical antenna is a modified dipole shape. Dipole modifications are often used to obtain wide-band operation without greatly increasing complexity. Wide angle biconical antennas are popular for their wide impedance bandwidth and omnidirectional radiation coverage and simplicity of mechanical design and installation. This antenna is constructed using metal sheets or solid cones, and is most practical in the upper UHF and microwave bands. Wire variations may be considered for lower frequency applications.

A simpler alternative to the biconical antenna is the common bow-tie antenna, which is essentially a planar bicone. It offers less weight and less cost to build, but has somewhat more performance variation over the operational frequency band than the biconical antenna. [Stutzman and Thiele]