The environment around radio navigation aids systems (navaids) includes buildings whose roofing materials interfere with signal propagation. This interference may cause partial loss of intelligence in communication between navaids and flying aircrafts. Buildings around airports have been restricted partly because they pose threats to flight navigation. This restriction as captured in the Laws of Kenya has not been supported by sufficient data. Previous studies have shown that about half of air accidents occur during landing. However, no data has been availed to determine the contribution of navaids to these accidents. The purpose of this research was to study effects of roofing materials on air navigation signal propagation. The method involved use of a 9.4GHz transmitter, a receiver and a computer to measure signal level transmitted through roofing materials at various angles of incidence.

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