Here's my solution for a 2m rig having only an integrated rubber ducky antenna and no connector for an external antenna.
Details at
https://nandustips.blogspot.com/2011/02/coupling-commercial-vhf-hand-held-to.html
73,
Nandu.
Details at
https://nandustips.blogspot.com/2011/02/coupling-commercial-vhf-hand-held-to.html
73,
Nandu.