This is a universal mount for the DJI O3 antenna and a pair of diversity ELRS antennas. Or, it can be used with a single ELRS antenna in either the vertical or horizontal orientation and the other part of the mount can simply be clipped off since it's printed in TPU. Fits standard 5mm standoffs with a spacing from about 20 mm to 35 mm. The mount protects the fragile tube of the DJI antenna from breaking.