Differentiate between wide band antenna and narrow band antenna

Hi Every One...
What is the Difference between wide band antenna and narrow band antenna?
what range of frequency will be called as narrow band and what range for wide band?

I guess thee is no exact consensus on that. Narrow-band antennas are typically resonant (dipoles, cavities) and cover < 5 % bandwidth. Wideband ones are horns and aperture antennas covering >5% bandwidth. Spiral and special antennas are used for ultra-wideband use, like 1 to 20 GHz, etc.