How to make a ghost box clearer for EVP

"I thought I would just show you a simple way on how to make the ghost box clearer using a simple cardboard box and aluminum foil to block radio waves. I apologise for the look of it as it does look like my packed lunch lol, but I can assure you it does work on dampening a lot of radio signals. This method will make any feint EVP's a lot more audiable. Blocking the airwaves does have its benefits but it also has it drawbacks, but fine tuning things to find an optimal amount of noise is what I am trying to do at the moment."