Radio sources are very weak, as they can travel through large distances. Radio sources also have photons with low energies compared to others electromagnetic waves (EM). Microwave photons have a little more energy than radio waves, infrared photons have still more, then visible, ultraviolet, X-rays, and the most energetic electromagnetic wave is gamma-rays. Radio astronomy studies are restricted due to radio frequency interference (RFI) produced by people. If this disturbance is not minimized, it poses critical problems for astrophysical studies. The purpose of this paper is to profile RFI maps in Peninsular Malaysia with a minimum mapping technique for RFI interference. Decision-making processes using GIS (Geographical Information System) for the selection requires gathering information for a variety of parameters. These factors affecting the selection process are also taken into account. In this study, various factors or parameters are involved, such as the availability of telecommunications transmission (including radio and television), rainfall, water lines and human activity. This mapping step must be followed by RFI site testing in order to identify areas of low RFI. This study will benefit radio astronomy research, especially regarding the RFI profile.

ABSTRACT
1. SPECTRUM MANAGEMENT
2. SITE SELECTION
    2.1. GIS
    2.2. Multi-Criteria Decision Analysis (MCDA)
3. RFI MAPPING TECHNIQUE
4. CONCLUSIONS
REFERENCES

• Roslan Umar(East Coast Environmental Research Institute, University Sultan Zainal Abidin/Faculty of Islamic Contemporary Studies)
• Sabri Nor Hazmin(School of Fundamental Science, Universiti Malaysia Terengganu)
• Zamri Zainal Abidin(Department of Physics, University of Malaya)
• Zainol Abidin Ibrahim(Department of Physics, University of Malaya)