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A wideband omnidirectional vertical polarised antenna is presented. By incorporating a shorted coupling top loading structure over two cross‐connected monopole antennas, an enhanced impedance bandwidth of 152% is achieved. The prototype antenna operates from 650 to 4500 MHz, with a reflection coefficient <−15 dB, a 2–6 dBi antenna gain with a very stable vertical radiation pattern and <3.5 dB horizontal pattern ripples. The proposed antenna can be widely used in indoor distributed antenna systems (DASs), such as GSM900, GSM1800, UMTS2100 and the enhanced TD‐LTE (up to 3.5 GHz) bands. The simulated and the measured return loss and radiation pattern results show good agreement.