A few days ago I made a trip to the VOR-DME near my local airport LOWG, because I always wanted to see one. It's GRZ on 116.2.
When I was there, I wondered why there is a giant metal grid under the actual antennas of the VOR.
Source: Klaus Krasser
Close picture:
Source: Klaus Krasser
The grids squares have a size of estimated 10x10 centimeters.
What is this grid for? Is it maybe used as a shield or reflector? 116.2 Mhz has a wavelength of ~2.6 meters, so the grid would reflect the radiation. If thats the use of the grid, why is it needed?