Is this just a CB silver rod with a 9.1 unun stuck to the bottom? It is around 18ft which is about the right size to. I use a 9.1 unun with a 10m windsock.
Pretty much Carl. And they really suck on 80m and 40. They start being usable from 20 up. And despite the claims, you do need radials otherwise you'll get a lot of common mode on the coax.
You would find no benefit over what you already have.