ORT is a new brand from Bali, Indonesia. Handmade and individually tuned. The 3 turn helical is good for goggle-mounted modules and long range flights
ORT 3 Turn Helical is designed to match with your circular transmitter antenna. The Helical has better axial ratio compare to cheapo circular patch antenna with printed PCB out there. If you handle ‘hard’’ RF environment such as surrounding with building & trees or need better penetration thru obstacles, and also light enough to mount in your goggles.