The Associated ARC-112 is a four foot coaxial adapter cable.
Unlike other similar jumpers, it uses low loss LMR-100 coaxial cable.
It features an SO-239 [M-J] at one end and a female SMA [SMA-J] at the other end.
This allows you to safely connect a PL259 antenna cable to your Anytone AT-D878UV.
For best results, attach to HT radio first.