This paper proposes serially arranged two parasitic elements above a fed di
pole to obtain broad bandwidth in resonant frequency of a parasitic element
. The above antenna can be used in triple-bands with one feed point. Its de
sign method using FDTD is also presented. Next, application of the triple-b
ands antenna is proposed for 3-sector base station antenna. Its characteris
tics of return loss and radiation patterns are indicated. Calculated values
are in good agreement with measured ones.