This is a fairing for the APM/Pixhawk telemetry antenna.Print it out at as fine resolution as you can. This antenna reqires you to cut off the plastic whip from your 3DR or RCtimer antennas! After cutting the plastic, DO NOT cut the RF shield that looks like an open cylinder below the actual antenna, separating the shielding from the inner antenna wire. Then, this fairing slips right over and can be secured to any airframe.