  In this paper we analyzed the Radio Frequency (RF) propagation
characteristics of monopole antenna in MICAz mote. During the experimental
analysis, two scenarios are considered. In Scenario-I, a pair of MICAz nodes
(one transmitting and one receiving node) are placed on the ground and the RSSI
is measured in presence of the ground effect. In Scenario-II, only the
transmitting node is placed above the ground; however, the receiving node is
placed on the ground. The RSSI is measured by changing the antenna orientation
at different angles and distances between them. The results show that the
ground effect, antenna orientation and distance between the sensor nodes
drastically affect the RSSI.
