(How) does an RF choke work, is it needed and how to make an effective one

Prevent radiating coax cable, changing antenna behaviour (including polarisation) and receiving unwanted man made noise. Simulated with MMANA and some calculations done on line. Links to the mentioned websites: Coil inductance calculator: https://www.allaboutcircuits.com/tool... Inductive reactance calculator: https://www.electronics2000.co.uk/cal...