ZMR 250 horizontal antenna mount for FlySky FS-IA6B

Printed with PLA Pro, 205C, 3 shells to make the thing durable and rigid enough.
OpenSCAD source attached.
Use 6mm heatshrink tubes or drinking straws (better option - they're more rigid) to cover the antennas.
Depending on how accurate your printer is, there will be some work (cutting and filing) to match final dimensions to real world. You can also tweak "tol" value in OpenSCAD sourcefile: it describes difference between "inside" dimensions (e.g. hole diameter): from theoretical (designed)