I wondering about the feasibility of making a 13.56 MHz antenna that would occupy the entire rack of a shelf (5'x2'). The range would need to be small so that it only identifies entities that are sitting on the shelf. I was thinking of using 13.56 because anti collision is more widely used in HF. Is it possible to design this antenna at 13.56 MHz or is it better to do it at a low frequency and find a way to implement anti collision on that? Thanks for the help