Radio wave environment measurement device

1. A radio wave environment measurement device comprising:

a multi-copter type unmanned flight vehicle configured to move in midair;

a polyhedron attached to an airframe of the multi-copter type unmanned flight vehicle, the polyhedron having a plurality of surfaces; and

an antenna provided on each of the plurality of surfaces of the polyhedron,

wherein the polyhedron is attached to the airframe across a gap between the polyhedron and the airframe, the gap being equivalent to 1 wavelength or larger in a working frequency band corresponding to the antenna.

2. The radio wave environment measurement device according to claim 1 , wherein the polyhedron is stationarily attached above the airframe in a vertical direction.

3. The radio wave environment measurement device according to claim 1 , wherein the polyhedron is stationarily attached below the airframe in a vertical direction.

4. The radio wave environment measurement device according to claim 1 , wherein the polyhedron is attached to the airframe with a support interposed between the polyhedron and the airframe, the support at least having a surface covered with a resin material.

5. The radio wave environment measurement device according to claim 1 , wherein the polyhedron has a shape of a regular polyhedron, and is attached to the airframe, with a center of the regular polyhedron disposed on a vertical line passing through a center of the airframe of the multi-copter type unmanned flight vehicle.

6. The radio wave environment measurement device according to claim 1 , wherein the polyhedron has a hexahedral shape.

7. The radio wave environment measurement device according to claim 1 , wherein the polyhedron has an apex, and is attached with the apex set counter to the airframe.

8. The radio wave environment measurement device according to claim 1 , wherein the polyhedron has a truncated pyramid shape.