Modification is also a problem as the rubber ducky is either integral or screwed on to a threaded stud, with no access to ground.
The result is a frustrated, repeater-bound ham.
Coupling the rig to an external antenna through another rubber ducky appeared to be a workable solution.
This was checked out with another rubber ducky mounted on a homebrew SWR meter, using a dial lamp as a load.
|Rubber ducky coupling to bulb load|
|Rubber ducky coupling to external antenna|
On-the-air tests were successful. Comfortable simplex QSOs, not possible with the rubber ducky alone, were now possible.