The Birth of Cantenna
The Spider has existed for a long time, frequently used by amateur radio operators.
A close relative of Cantenna, the “Coaxial Dipole” has also existed for a long time, but was not so popular as the Spider. It was mainly used in rubber ducky antennas of Hand-held radios. It has a very narrow diameter sleeve, which was made of a copper tube or pipe, slightly bigger in diameter than coax. It did not have the performance as good as it’s newly discovered wide-bodied relative, the Cantenna.
The Cantenna was born only about an year ago, as a result of series of my experiments on CoCo. In June 2014, I added a decoupling sleeve, made of Pepsi can cut to 69mm, at feed point of my CoCo. This experiment was not successful, possibly as the sleeve was too large in diameter for decoupling purposes.
Instead of discarding the sleeve (Pepsi can cut to 69mm), I decided to use it to make another type of antenna, the sleeved dipole, and it proved very successful. It’s performance was much better than “Coaxial Dipole”. This was birth of Cantenna.
After 2 months I renamed sleeved dipole to “Cantenna”.
**(1) Cantenna Invented by me - The Very First Cantenna ever made (June 2014): **
(2) Name “Cantenna” chosen by me (Aug 2014) - Originally I called it “1/2 λ sleeve dipole”: