Assertion: omni directional antenna | /r/HasAspect | signal loss
Facets:
value: on bottom
type: LOCATION
value: on the top
type: LOCATION
value: usually
type: TEMPORAL
Source sentences:
text: However omni-directional antennas in real life usually has signal loss on the top and bottom, and the radiation pattern would look more like a doughnut in 3D. In a two-dimensional view, it forms a figure-of-eight pattern in the vertical plane, and a circle in horizontal plane.