These are rugged, custom-made stainless steel (not aluminium!) telescopic whips that extend to 66" and collapse to just 13".

 

The base is standard 3/8-24 threaded brass which is reinforced for durability. Copper sleeves are used between tubes for conductivity.    Price is for one whip.

These are the best telescopic whips on the market!

             Price $28.00 each plus freight