Is there any efficient way to make an antenna radiate to the outside from inside a close metalic enclosure? I cannot drill any holes in it, nor place the antenna on the outside, nor change the material type.
I know that the metal acts as a shield and reflector for the radio waves. I was thinking on using a directive antenna and hope that the radio waves find their way out/in somehow, maybe through some open edges. This seems like some sort of impossible task, you have any alternatives to it?
I'm working over the GSM band.