The best build quality and performance! The helical antenna antennas from Circular Wireless have raised the bar when it comes to circular polarized antennas!
Helical Antenna 11dBi, 2370-2510MHz, right hand circular polarization, SMA female connector straight. Includes a SMA male-male angled adapter.
The helical antenna is one of the best directional antennas of circular polarization. It is highly tolerant, can vary slightly the diameter or pitch of the helix with virtually no impact on performance (although consistency is important), and the length or number of turns will determine the gain of the antenna.
I decided to build a model of 6.5 turns, with a gain of approximately 11dB, and a beamwidth of 60 degrees, making it easy to aim towards the plane, and is a good compromise between gain and antenna size.
As for the method for matching the impedance of the antenna, I opted for the Hecker transformer, because it gives consistent results, without requiring individual tuning with a SWR or a network analyzer.
Length: 213 mm
Diameter: 115 mm
Weight: 176 gr