An enclosure surrounding a Tx antenna cannot effectively act as a receiving antenna unless it is properly designed and wired. A metal cuboid lacks the necessary geometry, such as the two halves of a dipole, to generate differential currents and voltages required for reception. For effective operation, the enclosure must include a break, such as a slot, to allow electromagnetic fields to be detected. An ideal enclosure would present a pure reactance to the transmitter, resulting in no power delivery, which complicates practical applications.
PREREQUISITESElectrical engineers, RF engineers, and hobbyists interested in antenna design and electromagnetic theory will benefit from this discussion.
That's the key point, I believe. How are you going to wire up a metal cuboid to act as an antenna? An antenna develops a receive voltage at its output terminals as a result of the EM radiation generating differential currents and hence differential voltages. A cuboid doesn't have 2 halves like a dipole, and if you try to use it as a monopole with respect to a ground plane, I don't think the Tx antenna inside it will generate any differential currents or voltages with respect to the ground plane.genekuli said:of course it would all have to be wired up correctly