Antenna Gain & Range
Antenna gain (dBi) focuses RF energy in a direction. Omni antennas (1-3dBi) radiate in all directions — good for general flight. Patch/helical antennas (8-14dBi) focus energy in a cone — 2x gain = ~1.4x range. Range doubles with every 6dB increase in link budget (power + antenna gain).
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Linear vs Circular Polarization
Linear antennas (whip/dipole) are simple but suffer from multipath cancellation when signals reflect off objects. Circular polarized (CP) antennas (cloverleaf, Pagoda) reject multipath and are orientation-tolerant — the standard for FPV. Use matching polarization on both ends (CP with CP).
2.4GHz vs 900MHz for Control
2.4GHz offers smaller antennas and more frequency options but less penetration and range. 900MHz (868/915MHz) penetrates obstacles better and achieves 2-3x range but requires larger antennas. ELRS supports both; use 2.4GHz for general, 900MHz for long-range.
Antenna Placement & Maintenance
Mount VTX antenna vertically and away from carbon fiber (which blocks RF). Keep GPS antenna facing up with clear sky view. Inspect U.FL connectors — they are fragile and a loose connection destroys range. Use SMA connectors for high-vibration environments.
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