Antenna extension cable 3 m cable, with at the end a magnetic base/pedestal.
Useful because an existing antenna, now 3 meters closer to the transmitter/receiver can be placed.
Your own antenna, you can get off of the device and places on the pedestal/foot. The pedestal itself turn away from it on the camera, or other wireless device, so that the signal from the antenna 3 meters closer. Sometimes this is just sufficient, for interference-free picture.
Note the connections, whether direct 1 on 1 interchangeable, without using connectors.
Connection end of the cable:
Connection on socket
Not the right connections?
Then choose itself another SMA connector, to the entirely appropriate.