A novel, low profile and broadband plate loaded planar monopole antenna is investigated. The proposed antenna consists of a rectangular planar monopole with small plates attached to its radiating edges. Two types of plates, rectangular and cylindrical shapes are fabricated and tested. The characteristics of the antennas are investigated in both frequency and time domains. The paper shows that the proposed antennas are capable of achieving broadband and omnidirectional radiation characteristics within 2.9-17.9GHz with the cylindrical loading plates and 2.9-16.7GHz for the rectangular loading plates with a gain of up to 7dBi.