Most CPEs and routers come with built-in omnidirectional antennas designed for convenience rather than performance. While they work well in strong-signal areas, their limitations become clear in challenging environments such as:
Rural or remote locations
Indoor installations with thick walls or metal structures
Industrial sites with electromagnetic interference
Urban areas with congested networks
Built-in antennas receive signals from all directions equally, including noise and interference, which often results in lower signal quality and unstable connections.