Hm, why is that? How does an open stub prevent coupling from the antenna
to the feedline?

Roy Lewallen, W7EL

Al wrote:
Hello, Roy & the Group.

One think you may have missed, the original post was about a Arrow
Antenna J-Pole. This is an Open Stub type J-Pole, Not a Closed Stub
type like the copper pipe ones. The OSJ does not need a choke, it does
not have a problem with feedline radiation or a problem with Common
Mode Currents.


In the typical J-pole antenna, the shield connects to the long element
and the center to the stub. �I don't know your antenna in particular,
but I would suspect this is the case and don't believe it is considered
a radiating element.


The OSJ is not a typical J-pole.

73 Al Lowe N0IMW Arrow Antenna