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Antenna energy radiation and induction are directional; they are not emitted outwards from the tip, but rather spread outwards in a donut-like shape around the antenna (the Z-axis in the diagram).

For a transmitter, to ensure the strongest signal area on the "signal donut" covers the receiver, the best practice is to place the antenna perpendicular to the ground.

In this configuration, the receiver can handle both line-of-sight and multipath propagation wireless signals.
