I am wondering if aluminum foil will reflect EM waves. I know they can block it. I just tested it myself by covering my cellphone with one layer of aluminum foil and I could not call it. What I don't know and can't test because I don't have a meter is if the EM is reflected (either grounded or not grounded).
Like if you have something transmitting EM waves and you send them at an aluminum foil (either grounded or not), will the foil in theory reflect the waves and you get 2x the amount or does it just absorb the waves?
According to this video it sounds like it is reflected.
https://www.youtube.com/watch?v=tJhbf-wDft0