I'm about to design a system with a build in bluetooth module enclose in a box covered by a survival blanket. (little satellite model)
According to Wikipedia, the survival blanket is made of PET (mostly plastic) and a thin metallic sheet.
I'll using a HC-05 bluetooth module, since it's very cheap, I not 100% sure of it's capacity to acquire signals through the metallic sheet.
Do you think it going to work fine? Or should I build a small antenna extension outside the enclose box?
Since I have almost no knowledge about antenna design, I don't know how to build such a low cost antenna.