High-speed 5G communication system technology (up to 1Gbps) for mobile internet use requires a large capacity. Multiple Input Multiple Output (MIMO) technology is used in antenna design which aims to get a larger capacity. Driven by the need for very high speed of 5G technology, a large-scale MIMO Antenna was designed or called a Massive MIMO Antenna. Massive MIMO antennas with a very large number of arrays can provide significant efficiency improvements.Massive MIMO Antenna Design results in a very large antenna size that hinders the design process. The arrangement of Massive MIMO Antennas which consists of many antenna elements is a challenge in the design process due to the limited capability of the simulation software and the complicated process. Thus, a scalability technique is used to predict the results produced by a Massive MIMO Antenna with a certain configuration based on a simple MIMO Antenna compared with 4 elements, 16 elements, 64 elements MIMO configuration, etc. exponential increments. This research will discuss the scaling process to predict the specifications of a Massive MIMO Antenna. The designed MIMO antenna arrangement is based on the design of a rectangular antenna with a truncated corner and yield the formula of y=6.6384x^0.3069 of gain and y=100.33x^-0.481 of HPBW, while a circular antenna with an X slot and yield the formula of y=6.8514x^0.3027 of gain and y=100.72x^-0.485 of HPBW for further design with various types of configurations that work at a frequency of 3.5 GHz.