Abstract: A modified flush-disc antenna with characteristic of low profile, wideband and omni direction is proposed. The largest radiation of the antenna is at 45 degree. By adding slots and conducting pins, the antenna can achieve broad bandwidth and high horizontal gain with a low profile. The profile height of the antenna is far less than the operation wavelength in the center frequency 3.0GHz.The antenna covers a bandwidth of 2.5~4.0GHz. Its VSWR is smaller than 2 and the gain in the horizontal plane is up to -2dB. The antenna is simulated using software Ansoft HFSS and a practical measurement of the designed antenna is tested. The result of measurement is in good agreement with the result of simulation. The design requirements are satisfied.