I use 2 of these antenna's to experiment between 2 hackrf's.
I use a piece of semi-rigid cable with on one side a female SMA connector and the other side (smallest part from the antenna) the cable directly on the PCB .
Then i soldered the outer conductor from the semi-rigid cable on the middle lane on 3 places to secure the cable there (no bad influence to the antenna performance).
The semi-rigid cable is a inch longer than the antenna. That part i make stiff with some solder.
You can also solder a PCB SMA male or female connector in the prepared holes and connect there you coax cable.
But take care that this cable not influence the performance from that antenna.
I have to find a definitive solution for a non conductive stand for these antenna's.
But for now i use some hard foam where i push the antenna in
It works for me very well for indoor experiments.
But remind that a logper antenne is not selective. So you have to filter it by yourself.