Comment by kube-system

Nice! I've done a bunch of RF attenuation experiments with friends, and foil+microwave was the best result we found using stuff lying around any of our houses. With foil+microwave we were able to attenuate the signal enough to seriously degrade service, but never quite enough to block all traffic. In our experiments, the microwave was doing the majority of the work, based on the signal strength we observed. Results also varied a good bit by carrier, presumably because of the different bands used.

Tin-foil hat wearers beware.