Yup, 39". Be sure of your soldering skills before you start - there's not much room in there. Use a 15-20 watt pencil iron and "electronic" (tiny) rosin-core solder. Tin the end of the bare antenna wire, lay it on the solder pad on the PC board, and touch it with the tip of the iron. You should not have to apply more solder. It should melt instantly and you're done. Allow to cool.