I am working on a project that requires me to mount a WiFi antenna underneath a roof made of metal sheet. The antenna is mounted at a 2 m height, and the roof is just a few inches above the antenna.
I am using an omni-directional (dome shaped) antenna at the 5 GHz band. The proposed solution is to have a cut out on this metal sheet such that the antenna would still be able to transmit through it hence I was asked to provide the metal free zone required for my antenna.
Is this metal free zone related to the near field of the antenna? Or am I stupid. Please help