bow tie antennas

The biconical antenna is an omnidirectional wide band antenna. It's size determines its lowest frequency response, as it acts like a high pass filter. As frequency goes higher, away from the design frequency, the pattern of the antenna distorts and spreads.

Most bow tie antennas are a derrivative of the biconical antenna. The discone is half a biconical antenna. The bowtie is a planar (and therefore directional) antenna.