A planar low profile 1 x 4 antenna array with a parasitic element is proposed and experimentally investigated for mm-wave 5G applications. The four-element array realizes an overall board size of 24 x 18.85 x 1.57mm3. The proposed prototype with a copper thickness of 0.05mm is fabricated on a single layer of Rogers substrate RT/Duroid 5880 having a dielectric constant of 2.2. A gain of 11.94dB has been achieved by this design for the four-element array configuration which was only 5.23dB for the single element design. The simulated bandwidth of the design achieved is 6.208GHz in the range of 27.723GHz to 33.931GHz which is considered to cover certain frequency componenets of n257 band of FR2 5G NR spectrum and some frequency ranges of Ka Band. The prototype has been fabricated and measured for different parameters and the measured and simulated results find a good agreement between each other. Further, the array provides the directional beam with half power beam width (HPBW) of 45 degree with a peak value in the direction of -30 degree. The broadband, high gain performance and simple deign of the developed antenna array finds its application in future millimeter wave 5G communications.