Hi Kameechewa, it may not be strictly necessary to replace the antenna; however, we highly encourage contacting your system manufacturer in order to obtain a list of validated wireless adapter models for your computer.
The installation of these adapters is subject to country-specific regulatory approvals which include the system, wireless adapter and antennas. The system manufacturer must obtain these approvals from the respective authority.
Intel® Wi-Fi Products — Regulatory information regarding hardware installation or upgrade