Julian Palmer Design Monopole Probe Assembly for Cantenna 12/12/2025

Our intention is to design a cantenna where fine tuning can be achieved experimentally in the same device without needing to re-make the cantenna or physically cut bits off the monopole probe within it to achieve better performance. These ideas are based on the way that a Dobsonian optical telescope can be aligned in the field.

Our current plan is to make the monopole out of a threaded 99% copper rod, which then threads into a non-conductive block, which itself attaches to the cantenna via a groove – so that the rod can be lengthened or shortened inside the cantenna and the distance from the monopole to the rear of the cantenna can be varied in the groove (both are important measurements in cantenna tuning).

https://www.astronomy.me.uk/wp-content/uploads/2025/12/Cantenna-Isolated-Antenna-Assembly.pdf