Questions asking about the RF chokes used for qrp and portable field work, regularly come in. The one most often seen in my videos, is from Packtenna. I use this one with the Xiegu G90, Xiegu X5105, Yaesu ft-81x, Lab599 Discovery TX-500, and most recently the Icom IC-705.
In addition to that rf choke, you’ll find a few incredible antennas for the high speed low drag portable radio operator, on his website.
Another way is to build your own. Radio Prepper make an easy to follow tutorial on why to use an RF choke, and how to build one. Make sure you let Gil know how you found him.
73, Julian oh8stn