These telescopic whips are used to make our homebrew Buddipole or Buddistick antennas. Extended length is 72" and collapsed length is 13". The base is 1/4" x 20 threads.
We now make a knurled base sleeve which prevents the base from working loose over time, especially if the antenna is used in windy environments and/or in a horizontal position.
Stock up on these for your next antenna project!