I am working with my son on a science project to show the principles of a faraday cage. We want to place a walkie talkie inside a cage and demonstrate that it will not receive a signal. As an initial prototype we tried an aluminum plate with wire mesh covering the radio (see attached pic). (we grounded the mesh to the plate and then to the house's ground circuit and verified connectivity with an ohm meter). The walkie talkie still worked. We tried standing an aluminum tube on the plate with the radio inside and covered it with another aluminum plate, again grounded as before; and the radio still worked. We even wrapped the radio in a towel, and then wrap the towel in aluminum foil and then attached the foil to the house's grounding rod, and the radio still worked. The radio transmits on a frequency of 460 MHz. I know a faraday cage should work, but so far all we have proven is that they do not. Any idea what we are missing?
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