An example method of designing a multi-band antenna includes specifying a first portion of the multi-band antenna in a tangible medium, where the first portion corresponds to an existing design of a single-band monopole antenna for operating in a first frequency band, and specifying in the tangible medium a second portion of the multi-band antenna that is added to the first portion, where the second portion includes a dipole parasitic resonator that is resonant in a second frequency band.