13" Long Vintage Car Phone Antenna PKG (2) Time was, these were sticking through the trunk of every 1984 Taurus on the planet. Now the car phone is mostly a memory, but you can own the antennas for a song. These are passive, 13" long with the bottom 2-1/2" in a coil and a ferrite choke halfway up. Base has a 5/32" - 24 thread