These mounts fit under any 20x20 stack pattern to allow mounting an Immortal T antenna. They will fit any frame. On the BQE 5afx frame, these allow for enough clearance to use the mount with 4mm or 6mm thick arms, and places the antenna ends in a well protected area. 6mm thick arms are shown in the example photo.
These mounts are not intended for long range use. They put the antenna in a position which is well protected for proximity and short to mid range freestyle, but it is in close proximity to carbon fiber. If you are planning on flying long distance, you should use a diversity antenna set and mount your antennas as far away from the frame and electronics as possible.