What is a flowerpot antenna?
I’ve heard all sorts of answers to this question, most of them completely wrong. A quarter wave aerial, an end-fed aerial, a coaxial ground plane aerial… All incorrect. A flowerpot aerial is nothing more than a cleverly-fed half wave dipole. If you know how a dipole works, then you know how a flowerpot aerial works.
Here’s a very interesting link… https://www.hamradioforum.net/threads/4152-How-does-flower-pot-antenna-work
A ‘flowerpot’ aerial for 2 metres.
I believe it’s called a flowerpot aerial because someone in the U.S. stuck his in a flower pot and fixed plastic flowers all over it. It’s quite a good stealth antenna! It’s actually a great aerial, and extremely easy to make. Sorry about the photos below, they’re rather blurred. I’ve fixed the tube to a block of wood so I can stand the aerial in the loft. The SWR when holding the aerial at arm’s length is just about 1:1 but the best I can get in the loft is 1.4:1. I’ll have to move some more junk around to keep the aerial in the clear. I built the aerial to use with my Tait radio solely on our local two metre repeater. This saves tying up my main rig.
Here’s a link if you want construction details of the two metre version.
The video below shows the construction of a coaxial dipole for the aircraft band.
Two metres, aircraft band, marine band. Here’s a link to a dimensions calculator…