Look at the photo. On right - real (I sure) Nagoya NA-805, which I bought few years ago. On left - your antenna, which you name Nagoya NA-805. Right antenna is shorter and slightly thicker. The shell at the right antenna is made of hard material like metal, left - plastic.When I shake it - I don`t feel any motion inside right antenna, but there is feeling spring inside left antenna. The sticker on your antenna is almost peeled off. So I conclude that you sent a fake. I don`t know how good this antenna in work - I cant test it riht now, but uit is not real Nagoya NA-805
Works OK, good if you need to bit muffle down the signal a.k.a. calls from kitchen to bedroom :-)